Bowflex SelectTech 840 Adjustable Kettlebell
Eight to forty pounds with a turn of a dial: the Bowflex SelectTech 840 replaces six kettlebells in one compact footprint.
Our Verdict
A dial-adjustable kettlebell covering 8–40 lbs in 5-lb steps, replacing six separate bells. The top adjustable kettlebell pick of 2026 testing.
What We Like
- 8–40 lbs in one bell — 6 weights replaced
- Quick dial adjustment between sets
- Compact — fits in a closet
- Comfortable handle at all weights
- Works with the Bowflex app
Worth Knowing
- Max 40 lbs tops out for strong swings
- Dial takes a rep to get used to
- Heavier than a single fixed bell
- App features need subscription for some content
Who Is This For?
Home gym users doing swings, squats, presses and Turkish get-ups who want one bell instead of a rack.
The Full Picture
Kettlebell workouts live on progressive weight — the 840 lets you dial up as you get stronger without buying another bell. The selector mechanism is proven (same family as the SelectTech dumbbells), and the whole thing stores in about a square foot.
Bottom Line
The adjustable kettlebell that replaces a whole set — 8 to 40 lbs in one dial.