Barbell squat
Barbell squat is a common action. It requires feet to be shoulder-width apart, waist and abdomen to be tightened, and barbells can be placed in front of or behind the neck. Then slowly squat down to below 90 degrees, and after a short pause, the legs and hips get up. Get up quickly, keep your waist straight and don't lean forward.
The dumbbell's longitudinal shoulders should stand naturally, and hold the weight with both hands to stretch it. Lift your shoulders up slowly and aim at your ears. If you can hold them to your ears, that's the best. Chest out and abdomen in, shoulders moving up and down. Remember not to swing from side to side. Because holding a heavy object, swinging can easily cause muscle contusion.
Dumbbell-shaped longitudinal shoulder
Belly rolling is easy to be made into sit-ups, but in fact, the two are different. Lie on your back with your knees bent about 90 degrees and your legs together. Relax your back as much as possible and lift your upper body, but don't let your lower back touch the ground. Cross your hands on your chest or hold your head, and then recover.
Abdominal rolling