Weights and Dumbbells / Weight Sets / Dumbbell SetsA Dumbbell is a weight consisting of a short bar with a metal ball or disk at each end that is lifted for muscular development and exercise. Dumbbells now come in many shapes sizes and combinations. Our most popular dumbbells are the multi-purpose, all-in-one type like the PowerBlock models or the Stamina Select Dumbbells that adjust from 5lbs to 52.5 lbs with a turn of a dial. Most people who workout with dumbbells also use an adjustable workout utility bench to sit and support themselves. a bench that adjusts from decline to flat to incline.