Dumbbell is an auxiliary equipment for weightlifting and fitness. The caliber of dumbbell pieces is not all the same model, and the most normal is between 2-3cm.

Dumbbell is a simple instrument to strengthen muscle strength training. Its main material is cast iron, some of which are covered with rubber. Used for muscle strength training and muscle compound action training. Patients with low muscle strength due to paralysis, pain and long-term inactivity. Holding dumbbells, you can use the weight of dumbbells to actively exercise against resistance and train muscle strength.