Action, stand naturally, with your back straight, your legs straight, and your feet open shoulder-width. Hold a bottle of mineral water in each hand, cooperate with breathing, raise your arm when inhaling, keep it above your head, straighten your arm, keep moving, exhale, inhale again, slowly lower your arm when exhaling, and then raise it. Lift 30 times as a group, rest for two minutes between groups, lift three groups of movements every night and exercise every day.

I wish you a charming back.