-The correct movement of lifting dumbbells in Shenzhen fitness field should be-standing or sitting, with straight back, lifting dumbbells with both hands, arms apart so that the upper arm is parallel to the ground and the forearms are vertical to the ground. This is the initial position, much like the action of surrender; Push the dumbbell to the top of your head with shoulder strength, and the motion track is arc. Be careful not to collide with two dumbbells; Stop lifting before the elbow is completely straight, turn to a slow and controlled descent, and stop descending when you return to the initial position. Generally, do 3 ~ 4 groups, each group 10 ~ 15 times. The barbell press and mechanical press in dumbbell press can fully exercise shoulder muscles; Using dumbbells to do side lifts, forward lifts and oblique side lifts can independently exercise the front, middle and back muscles of the shoulder. Don't exercise your shoulders by lifting dumbbells too often, but give it a longer rest time, and the effect will be better.