Empty room with a dark accent wall and wood floor, ready for a home gym

BowFlex SelectTech 840 Adjustable Kettlebell

Best adjustable. Beginners, apartment dwellers and circuit-style workouts that need quick weight changes under 40 lb; BarBend’s Best for Beginners and Garage Gym Reviews’ Most User-Friendly adjustable (4.1/5).

$149.00
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Description

Why we picked it

What to know before you buy

Key specs

  • Six settings: 8, 12, 20, 25, 35 and 40 lb via a turn-of-a-dial selector
  • Replaces six kettlebells in one 40 lb footprint; ships with cradle base
  • Composite (plastic) shell over steel plates with a welded steel handle
  • Fastest weight change of any adjustable tested (seconds, no tools)
  • 2-year warranty on manufacturing defects; 2-month JRNY app trial included

Where to buy: BowFlex · Amazon. Availability verified Sep 22, 2026.

Read the full guide: Best Kettlebells for a Home Gym →

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Additional information

Brand

Bowflex
Best for

Best adjustable
Verified in stock

Sep 22, 2026
Key specs

Six settings: 8, 12, 20, 25, 35 and 40 lb via a turn-of-a-dial selector, Replaces six kettlebells in one 40 lb footprint; ships with cradle base, Composite (plastic) shell over steel plates with a welded steel handle, Fastest weight change of any adjustable tested (seconds, no tools), 2-year warranty on manufacturing defects; 2-month JRNY app trial included

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