The purpose of fitness is to reduce fat, so we should pay attention to endurance training and increase calorie consumption. During the training, it is mainly in multiple and medium groups, and each movement is 15-20 times, repeating 5-6 groups. Choose a pair of dumbbells with moderate weight for training. Boys choose a pair of dumbbells of 10- 15KG, and girls choose a pair of dumbbells of 5- 10KG.

The purpose of fitness is to gain muscle, so we should pay attention to the development of muscle dimension and strength. Training should focus on fewer times and fewer groups, such as 8- 12 times for each movement and repeating 3-4 groups. Choose heavy dumbbells for training, boys choose a pair of dumbbells of 20-35KG, and girls choose a pair of dumbbells of 10- 15KG.

Extended data:

When training muscle groups in different parts of the body, these target muscle groups bear different forces, so it is impossible to train all muscle groups with the same weight. For example, the large muscle groups of the body, such as back muscles, chest muscles, buttocks and legs, are all large muscle groups of the body, and the applicable weight will be greater. When doing bench press, squat and hard pull training, you can choose a larger weight.

Shoulder is a small muscle group of the body, which is easy to be injured, has poor endurance and relatively light weight, while arm belongs to a small muscle group, but it often exercises and will also participate in the training of large muscle groups, so the arm strength level will be higher, and the weight will be relatively higher when training such as bending the arm.

When choosing dumbbell movements, we should pay attention to the fact that compound movements take precedence over isolated movements, such as pushing, rowing, hard pulling, bench pressing, squatting, punching, buttock pushing, etc., because compound movements can drive the development of multiple muscle groups at one time, and the fitness efficiency will be more efficient.