Top Pick for Space-Saving Strength Training
$149.00 · baraffiliate-stars score 9.0/10 · 4.8/5 stars · 7,683 Amazon reviews
The BowFlex SelectTech 840 is an adjustable kettlebell that replaces six separate kettlebells (8, 12, 20, 25, 35, and 40 lbs) in one compact composite shell. A turn-of-a-dial mechanism locks in the chosen weight, so you can move between swings, rows, squats, presses, and twists without swapping equipment. It ships with a 2-month free trial of the JRNY app for guided workouts, and its 8.8″ x 7″ x 12.5″ footprint is built for small home gyms and apartments.
The Verdict
This verdict is based on our analysis of verified Amazon review data, aggregated owner sentiment, and real customer testimonials — not a physical hands-on test by our team. Across more than 7,600 ratings, 86% are 5-star, and the recurring themes are how solidly each weight setting locks in, how much space the design saves versus a full kettlebell rack, and how well it holds up to daily use over months of training. A recurring caveat from more experienced lifters: the jump between the 25 lb and 35 lb settings is large, and the composite shell and handle feel different from a solid cast-iron bell.
What We Liked
- 4.8/5 stars across 7,683 ratings, with 86% at 5 stars
- One dial replaces 6 kettlebells (8 to 40 lbs) in a single compact unit
- Weight settings lock in solidly with no wobble during swings or presses
- Space-saving design fits easily in a closet, bedroom corner, or small apartment
- Includes a 2-month free trial of the JRNY workout app
What Could Be Better
- Big jump between the 25 lb and 35 lb settings, with nothing in between
- Composite shell and handle feel different from a solid cast-iron kettlebell
- Grip is narrower and smoother than dedicated cast-iron kettlebells, which some experienced lifters notice
“Outstanding! We love this device. Makes working out easy, but with great results. 6 weeks in and both my wife and I love it. The adjustable weight function is a great idea. Solid construction. We both feel a stronger core, glutes and thighs, as well as biceps. We are 70+ and love this.”
“The Bowflex SelectTech kettlebell is a game changer for my home gym. It’s super easy to adjust the weight with just a quick turn of the dial, and it replaces multiple kettlebells in one compact design. The build feels solid and durable, and the grip is comfortable for swings, squats, presses, and more.”
BowFlex SelectTech 840 vs. REP Fitness Adjustable Kettlebell — Which Should You Buy?
Both are dial-adjustable kettlebells aimed at space-conscious home gyms, but they take slightly different approaches to the same job.
| Product | BowFlex 840 | REP Fitness |
|---|---|---|
| Our Score | 9.0/10 | 8.4/10 |
| Price | $149.00 | $159.99 |
| Amazon Rating | 4.8/5 (7,683 reviews) | 4.7/5 (136 reviews) |
| Best For | Widest single-unit weight range (8-40 lb) plus app-guided workouts | Steel construction with an ergonomic handle for a traditional kettlebell feel |
| Check Price → | Check Price → |
Best Overall Pick — Adjustable Kettlebells
The BowFlex SelectTech 840 edges ahead on price, total ratings, and space-saving versatility, making it our top pick for home strength training.
As an Amazon Associate, NVERA earns from qualifying purchases. This verdict is based on our analysis of verified Amazon review data, aggregated owner sentiment, and real customer testimonials — not a physical hands-on test by our team.