The Bowflex Selecttech Dumbbells offer resistance ranging from 5 pounds to 50. The dumbbells feature a dial that changes weight resistance in 2.5-pound increments. There are 15 settings, and Bowflex has a two-year warranty on all of the units’ parts. Bowflex says there are more than 30 exercises available with the dumbbell set.

Bowflex, www.bowflex.com