1, long-term practice of dumbbells can modify muscle lines and increase muscle endurance. Regular heavy dumbbell exercises can make muscles strong, strengthen muscle fibers and increase muscle strength.

2, can exercise upper limb muscles and waist and abdomen muscles. For example, when doing sit-ups, putting dumbbells behind your neck with both hands can increase the load of abdominal exercises; Lifting dumbbells to do lateral bending or turning exercises can exercise the internal and external oblique muscles of the abdomen; Keep your arms straight forward and lift dumbbells sideways to exercise your shoulder and chest muscles.

3, can exercise lower limb muscles. For example, squat with dumbbells on one foot and jump with both feet.

Extended data:

Dumbbell is a simple instrument to strengthen muscle strength training. The main material of kinetic energy dumbbell is cast iron, and some of them are covered with rubber. Used for muscle strength training and muscle compound action training. Patients with low muscle strength due to sports paralysis, pain, long-term inactivity, etc. Holding dumbbells, you can use the weight of dumbbells to actively exercise against resistance and train muscle strength. Dumbbells can train a single muscle; If you increase your weight, you need the coordination of multiple muscles, and it can also be used as a kind of muscle compound action training. Using dumbbells scientifically can really get good exercise effect. It is said that Schwarzenegger's bodybuilding muscles are mainly obtained through dumbbell exercise. However, there are indeed many people who have neither increased their strength nor become fit after exercising with dumbbells, and they are often disheartened. Dumbbells have also been shelved and even become a substitute for hammers. In fact, dumbbell fitness is very knowledgeable. If you don't do it, the exercise effect will often be disappointing.

References:

Dumbbell _ Baidu Encyclopedia