Bowflex SelectTech 840 Kettlebell Review: Space-Saving Adjustable Weight Training
Want one kettlebell that acts like six? The Bowflex SelectTech 840 promises exactly that.
It uses a simple dial to switch weights fast. You go from 8 lbs to 40 lbs in seconds.
This design saves space in your home gym. You skip the clutter of multiple kettlebells on the floor.
The JRNY app adds guided workouts to keep you motivated. It pairs smart tech with old school strength training.
But does it feel as sturdy as a classic cast iron bell? Many users report concerns about the plastic build and handle comfort.
We tested the swings, squats, and presses. We checked the balance and the noise level too.
This review breaks down the good and the bad. You will learn if this adjustable bell fits your fitness goals. Let’s dive into the full performance details.
In a Nutshell
Here is the quick rundown on the Bowflex SelectTech 840. Check these points before you decide.
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Best for swing based moves: This kettlebell shines during swings and basic cardio drills. It struggles a bit with Turkish get ups and other complex lifts.
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Build quality rating sits at 3 out of 5. The plastic shell works fine but does not match the feel of solid cast iron bells.
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Handle shape needs work. Some users find grip comfort lacking during longer sessions.
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Weight balance feels off at times. You may notice a slight wobble during fast movements.
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Rattling noise pops up occasionally. This happens more at higher weight settings.
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A solid pick for beginners and home gym owners who value space. It fits well if you want variety without buying six separate bells.
If you want something closer to a traditional kettlebell feel, the REP Fitness Adjustable Kettlebell is worth a look too. Overall, this bell works best for simple routines and casual training goals.
Build Quality and Materials
The Bowflex SelectTech 840 uses heavy plastic as its main material. This construction choice keeps the weight down and enables the dial adjustment system to work smoothly. However, many users feel the plastic shell lacks the solid reassurance of traditional cast iron kettlebells.
The handle design raises concerns for serious lifters. The grip surface feels less secure during explosive movements like swings. Your hand may slip slightly during intense sessions, which affects your confidence and form. The handle also sits at an awkward angle for some exercises beyond basic swings.
Weight distribution problems show up during use. The internal mechanism that shifts between 8 to 40 pounds doesn’t sit perfectly centered. This creates an unbalanced feel when you hold the kettlebell at different angles. Turkish get-ups and goblet squats feel wobbly compared to a standard bell.
The rattling noise occurs more often at higher weight settings. Users report hearing internal components shift as you move. This distraction breaks your focus during workouts and signals potential durability issues over time. The noise suggests the dial mechanism has some play in it.
The plastic shell also shows vulnerability to damage. Drop this kettlebell on hard flooring, and the plastic cracks more easily than cast iron would. Repeated impacts in a busy home gym add up quickly.
On the positive side, the dial mechanism itself works reliably. Switching weights takes just seconds without any sticking or jamming. The compact footprint means you save shelf space compared to six separate kettlebells.
The overall build quality earns a 3 out of 5 rating. The plastic construction serves its purpose for light to moderate workouts. Beginners benefit from the quick weight changes and space savings. However, if you perform advanced kettlebell moves or expect gym-grade durability, the material choices disappoint. The handle and weight balance simply don’t match what traditional kettlebells deliver for serious training.
- TURN OF A DIAL: With the turn of a dial, you can easily adjust from 8 to 40 lbs., rapidly switch from one exercise to...
- SPACE EFFICIENT: Replaces up to 6 kettlebell with weights at 8, 12, 20, 25, 35, and 40 lbs.
Last update on 2026-10-26 / Affiliate links / Images from Amazon Product Advertising API
Weight Range and Adjustment Mechanism
The Bowflex SelectTech 840 uses a dial-based adjustment system that lets you switch between six preset weight increments without swapping kettlebells. You simply rotate the dial, and the internal mechanism locks into your chosen weight.
This system covers 8 pounds all the way up to 40 pounds. The six preset stops give you clear, distinct weight jumps. You won’t find infinite micro-adjustments here, but that keeps things simple and fast.
The dial mechanism itself performs reliably during normal use. Users report that the rotation feels smooth and clicks into place without hesitation. This is one area where the design actually works well. You can change weights in seconds, which beats hunting for individual kettlebells in your garage.
However, the weight distribution inside the kettlebell raises some concerns. At higher weight settings, users notice the internal components don’t sit perfectly balanced. This creates a slight wobble during fast movements and explosive exercises. The imbalance becomes more noticeable when you’re doing swings or jerks at the 35 to 40 pound range.
The plastic housing also contributes to durability questions. The dial connects to internal gears and weights, but the outer shell feels hollow compared to solid cast iron. Some owners report rattling sounds, especially when using the heavier settings. This noise comes from components shifting slightly inside the plastic body.
For basic swing movements, the weight adjustment works fine. You’ll appreciate the speed of switching between sets. But if you plan serious pressing or Turkish get-ups, the balance issues become frustrating. The dial system itself is clever, but the overall execution has gaps.
The mechanism replaces the need for six separate kettlebells, which saves real space in your home gym. Just understand that this convenience comes with trade-offs in stability and build quality. The adjustment system is functional, not flawless.
Performance and Exercise Versatility
The Bowflex SelectTech 840 delivers solid performance for swing focused workouts and basic cardio drills. The dial mechanism switches smoothly between weight increments, making transitions quick and seamless during exercise routines.
Swing exercises shine with this kettlebell. The weight adjustment system handles dynamic movements well. You can move from one weight to the next without stopping your flow. This speed matters when you’re doing high rep sets or circuit training.
Beyond swings, performance drops noticeably. Presses and goblet squats feel awkward with this design. The unbalanced weight distribution creates instability during slower, controlled movements. You’ll notice the wobble more clearly when you pause at the top of a rep.
The handle presents real challenges for extended use. Grip comfort suffers during longer sessions, especially as fatigue sets in. Your hands may slip slightly or feel cramped compared to traditional kettlebells. This matters if you’re doing high volume training or back to back sets.
Rattling becomes more obvious at higher weight settings. The internal mechanism that shifts between 8 to 40 pounds creates noise during fast movements. This distraction pulls your focus away from form and breathing. Some users report the plastic housing feels hollow and less substantial than cast iron alternatives.
The plastic construction works fine for basic movements. It doesn’t match the solid feel of traditional kettlebells though. The material shows vulnerability to damage over time, especially with heavy use or drops.
For beginners and home gym owners, this kettlebell serves a purpose. You get variety without buying six separate kettlebells. Space savings matter in smaller homes or apartments. The dial mechanism itself performs reliably during normal use.
Serious lifters should consider alternatives. The performance limitations during non swing exercises become frustrating quickly. You’ll outgrow this kettlebell faster if you follow a structured program beyond basic cardio work.
The SelectTech 840 works best as a starting point. It introduces kettlebell training without major space commitments. Performance and exercise versatility improve significantly with traditional kettlebells once you’re ready to progress.
Top 3 Alternatives
Kettlebell Kings Adjustable Kettlebell
- 41 Kettlebells in 1 - Adjusts from 12 to 32 kg in 0.5 kg jumps for 41 weight settings in one competition-shape bell...
- Ergonomic Competition Shape with 35 mm Handle -Competition-style shell with a 35 mm handle, consistent diameter, and...
Last update on 2026-10-26 / Affiliate links / Images from Amazon Product Advertising API
Kettlebell Kings makes a solid adjustable kettlebell for home workouts. You get smooth weight transitions without the hassle of buying multiple kettlebells. The handle feels comfortable during swings and goblet squats. The design focuses on durability, so it handles consistent training sessions well.
The weight increments work smoothly. You can adjust resistance quickly between exercises. This saves time during circuit training. The kettlebell sits stable on the ground, which matters for safety during explosive movements.
Yes4All Adjustable Kettlebell
- 7 WEIGHTS IN 1: The adjustable kettlebell weight set offers 7 settings - 7.8, 12.4, 17.9, 23.9, 29.9, 35.4 & 40 lb...
- SPACE-SAVING DESIGN: Standing 10 inches tall, this compact gym equipment fits neatly in closets, shelves, corners, or...
Last update on 2026-10-26 / Affiliate links / Images from Amazon Product Advertising API
Yes4All offers an affordable option for beginners and intermediate lifters. The adjustable system lets you change weights easily. You won’t need a shelf full of kettlebells taking up space. The compact design works great for small home gyms.
The handle diameter stays comfortable across all weight settings. You can perform Turkish get-ups and single-arm rows without grip fatigue. The base remains stable during rest periods between sets. This kettlebell gives you flexibility for different training styles.
Rogue Adjustable Kettlebell
- KETTLEBELLS ADJUSTABLE WEIGHT: Utilize this PowerBlock kettlebell set that feels like solid iron with the advantages of...
- COMPACT ADJUSTABLE KETTLEBELL: This adjustable kettlebell is the most ergonomic and compact option for strength...
Last update on 2026-10-26 / Affiliate links / Images from Amazon Product Advertising API
Rogue builds kettlebells with serious quality standards. The construction feels premium and built to last years. Weight adjustments happen fast, keeping your workout flow smooth. The handle coating prevents hand slipping during sweaty sessions.
The kettlebell works for strength training and conditioning drills. You can perform snatches, cleans, and presses with confidence. The balanced weight distribution makes movements feel natural. Rogue’s reputation means you get reliable equipment that performs consistently.
Handle Design and Grip Comfort
The handle on the Bowflex SelectTech 840 presents a significant concern for anyone planning extended kettlebell sessions. The grip design feels awkward compared to traditional kettlebells, which can affect your comfort during longer workouts.
The handle uses a plastic construction that matches the rest of the kettlebell’s body. This material choice creates a smooth surface, but it lacks the texture you find on standard kettlebell handles. Your hand may slip more easily, especially during dynamic movements or when you’re sweating.
Grip width matters for kettlebell work, and this model’s handle feels narrower than optimal. The compact design makes sense for a space saving device, but it forces your hand into a tighter position. This becomes noticeable during two handed exercises where you need more room for both hands.
The handle diameter itself feels thin in your palm. Most users report that their grip tires faster than with conventional kettlebells. This fatigue limits how long you can perform exercises comfortably, which cuts into your workout duration.
The unbalanced weight distribution compounds the handle issues. When you lift the SelectTech 840, the weight doesn’t feel centered the way a traditional kettlebell does. This throws off your natural grip position and forces your wrist and forearm to work harder for stability.
Users mention that the handle becomes less comfortable at higher weight settings. The 40 pound maximum setting feels particularly awkward in the hand. The plastic handle doesn’t provide the reassuring feel of cast iron or steel either.
For basic swing movements, you might adapt to the handle design fairly quickly. However, if you plan to use kettlebells for Turkish get ups, snatches, or other complex movements, the grip design creates real limitations.
The handle design is one area where the Bowflex SelectTech 840 shows its compromises. The space saving benefits come at the cost of comfort and control. If grip comfort matters to your training style, this kettlebell may frustrate you during longer sessions.
JRNY App Integration and Guided Workouts
The JRNY app transforms how you use the SelectTech 840 kettlebell. This mobile platform connects directly to your device and guides you through structured workout routines.
Guided workouts form the core of what JRNY offers. The app provides video instruction for kettlebell exercises that go beyond basic swings. You see proper form demonstrations before you start each movement. This helps you understand the correct technique, especially if you’re new to kettlebell training.
The app tracks your progress automatically. When you complete a workout, JRNY records which exercises you did and how much weight you used. Over time, this data builds a picture of your fitness journey. You can see patterns in your performance and identify areas where you’ve improved.
Personalized programming adjusts based on your fitness level. JRNY asks questions about your experience and goals when you first set up the app. The algorithm then creates workout plans suited to your needs. Beginners get different routines than advanced users. This customization helps everyone stay challenged without feeling overwhelmed.
The app includes multiple workout styles to keep things fresh. You’ll find cardio focused sessions, strength building routines, and endurance challenges. Variety prevents boredom and works different aspects of your fitness. The SelectTech 840’s quick weight adjustment pairs perfectly with these changing demands.
One important note: the app’s guidance matters more for this kettlebell than others. Since the handle and weight distribution present challenges for extended use, having expert form cues helps you work around these limitations. The app encourages proper technique that minimizes strain on your grip and shoulders.
JRNY also builds community features into the platform. You can join challenges with other users and see how your workouts compare. This social element keeps motivation high, especially on days when training feels difficult.
The app integration essentially extends what this kettlebell can do. While the physical design has compromises, the digital coaching and programming help you achieve real fitness results. JRNY transforms the SelectTech 840 from a simple weight adjustment tool into a complete training system.
Pros and Cons
Pros
- Replaces six separate kettlebells, saving significant space in your home gym
- Weight switches instantly with a simple dial turn for seamless transitions between exercises
- Solid performance for swing movements and basic cardio drills
- JRNY app integration provides guided workouts and tracks your progress automatically
Cons
- Heavy plastic construction feels less sturdy than traditional iron kettlebells
- Handle design is narrow and uncomfortable, especially at higher weight settings where rattling becomes noticeable
- Unbalanced weight distribution makes certain exercises like Turkish get-ups and overhead work feel awkward
- Limited effectiveness for non-swing exercises compared to standard kettlebells
Who Should Buy It
The Bowflex SelectTech 840 works best for people with limited space who want multiple kettlebell weights without cluttering their home gym. If you live in an apartment or have a small workout area, this single adjustable unit replaces six separate kettlebells.
Beginners benefit from the JRNY app integration. New lifters get guided workouts that teach proper form for swing movements and basic cardio drills. The app adjusts difficulty based on your fitness level, so you’re not overwhelmed or bored. Progress tracking happens automatically, which keeps motivation high.
Swing enthusiasts should consider this kettlebell seriously. The SelectTech 840 performs solidly for swing movements and explosive cardio work. If your main goal is swinging, you’ll adapt to the handle fairly quickly despite its narrower design.
Skip this kettlebell if you do Turkish get-ups, overhead presses, or advanced kettlebell exercises regularly. The unbalanced weight distribution and awkward handle feel uncomfortable for these movements. You’ll struggle more than with traditional kettlebells, and that frustration adds up during longer sessions.
Home gym owners on a space mission will appreciate the dial-based weight switching. Changing weights takes seconds instead of swapping between different kettlebells. This speed keeps your workout flowing without interruption.
The plastic construction concerns anyone planning extended kettlebell sessions. You won’t get the same sturdy feel as traditional iron kettlebells, and rattling becomes noticeable at higher weight settings. If durability matters most to you, look elsewhere.
Fitness enthusiasts who want app-guided programming find real value here. The JRNY platform extends what this kettlebell can do beyond basic swings. Community features and personalized programming keep workouts fresh and engaging.
Avoid this model if you need a kettlebell for serious strength training or advanced movements. The handle design and weight distribution create real limitations for anything beyond basic swings and cardio drills.
This kettlebell suits people who want convenience, app guidance, and space savings. It works perfectly for swing-focused workouts in small living spaces. Just know its limits before committing.
Final Verdict
The Bowflex SelectTech 840 earns its place as a smart space solver for home gyms. It brings six kettlebells into one compact tool. That alone makes it worth considering for many lifters.
But this kettlebell has clear limits. The 3 out of 5 star rating reflects real build quality concerns. Plastic construction and handle issues hold it back from greatness.
Think of this kettlebell as a specialist tool, not an all rounder. It shines for swings, cardio circuits, and basic conditioning work. It struggles when exercises demand precision grip or balance.
Compare it to the REP Fitness Adjustable Kettlebell. REP Fitness often gets praised for sturdier construction and better handle comfort. If build quality tops your priority list, that competitor deserves a look too.
Still, the Bowflex option offers something unique: app connected training that most competitors skip. This feature adds real value for beginners who want structure.
So who should buy this kettlebell? Pick it if space matters most in your decision. Pick it if you mainly do swings and want app guidance along the way.
Who should skip it? Serious kettlebell athletes doing complex lifts should look elsewhere. Turkish get-ups, cleans, and heavy overhead work need better balanced tools.
The verdict comes down to your training style. This kettlebell trades some durability and feel for convenience and smart features. That trade works great for casual users and beginners.
It works less well for advanced lifters chasing traditional kettlebell mastery. Know your training goals before deciding.
Bottom line: the Bowflex SelectTech 840 delivers solid value for specific use cases. It won’t replace a full kettlebell set for serious athletes. But for space conscious beginners wanting guided workouts, it earns a genuine recommendation.
Weigh your priorities carefully. Space saving and app guidance versus premium build quality. Your answer determines if this kettlebell fits your home gym.
Frequently Asked Questions
Does the Bowflex SelectTech 840 work for overhead exercises?
No, it doesn’t work well for overhead movements. The unbalanced weight distribution makes pressing and overhead work feel awkward and unstable. If you plan to do overhead presses or similar lifts, you need a different kettlebell. Traditional iron kettlebells perform much better for this type of training.
Can I use this kettlebell for Turkish get-ups?
Turkish get-ups are not ideal with this model. The weight distribution issues make the movement uncomfortable and harder to control. The narrow handle also adds difficulty during the transition phases of the exercise. Skip this kettlebell if Turkish get-ups are part of your routine.
How does the JRNY app help my workouts?
The JRNY app provides guided workouts that teach proper form for swing movements and basic cardio drills. Your progress gets tracked automatically, so you can see improvement over time. This feature works best for beginners learning kettlebell basics. The app integration is one feature that sets this model apart from other adjustable kettlebells.
Is the plastic construction a real concern?
Yes, it matters if you plan long training sessions. Heavy plastic feels less sturdy than traditional iron kettlebells. Users report rattling at higher weight settings. The handle design is narrow and uncomfortable when weights increase. If durability and a solid feel matter to you, traditional kettlebells are the better choice.
Who should actually buy this kettlebell?
Buy it if space is your main concern and you swing kettlebells regularly. Beginners benefit from the app guidance. Home gym owners with limited room appreciate the dial switching. Skip it if you do complex lifts like Turkish get-ups, overhead presses, or advanced kettlebell work.
DK is a passionate wellness advocate and product reviewer dedicated to helping readers make informed decisions about health-enhancing tools and devices. With a keen eye for quality and functionality, DK provides honest, thorough reviews and comparisons to support your journey toward better living.
