Bowflex SelectTech dumbbells use a dial. You turn it to pick the weight and lift the handle out of the cradle. That makes weight changes quick, which suits circuit-style workouts and supersets. Buyer feedback often mentions the plastic parts and the bulky ends, which can make some movements feel awkward.

Who it is for: people who change weights often and want speed.

• Pros: very fast changes, popular and widely reviewed, replacement parts are available from the brand.
• Cons: larger ends than regular dumbbells, and some buyers report wear on the mechanism over time.

Verdict: an easy choice if speed matters more than a traditional feel.

Based on specs and verified buyer reviews, not our own testing. Specs and prices change, so check the current listing on Amazon. As an Amazon Associate I earn from qualifying purchases.