1, dumbbell, auxiliary equipment for weight lifting and fitness, smaller than barbell. The weight of light dumbbells is 6, 8, 12, 16 kg, and the weight of heavy dumbbells is 10, 15, 30 kg. Because there is no sound during practice, it is named dumbbell.

2, attributes: simple equipment to enhance muscle strength training.

3. Definition: Dumbbell is a simple instrument to strengthen muscle strength training. Its main material is cast iron, some of which are covered with rubber.

4. Dynamic dumbbell: used for muscle strength training and muscle compound exercise training. Patients with low muscle strength due to paralysis, pain and long-term inactivity can hold dumbbells and use the weight of dumbbells to actively exercise against resistance and train muscle strength.

5、