Don't underestimate a 10-pound dumbbell. They can challenge your body in an entirely new way, especially if you're used to lifting heavy.
Lighter weights target the small muscles that stabilize your joints -- muscles that get overpowered by larger ones when you use heavier weights.
Plus, you can toss around a 10-pound dumbbell with much more speed and power than you could a 50-pound weight, which makes them perfect for a metabolic workout.
In the video above, Men's Health Fitness Director BJ Gaddour -- who can overhead press a pair of 100-pound dumbbells and make it look easy -- demonstrates a full 100 ways to take advantage of the small side of the dumbbell rack.