Stand up straight with your legs together, tighten your anus and straighten your back. While exhaling, raise your arms above your head, hold your elbows with your right and left hands, keep this posture, and repeatedly move your heels off the ground and touch the ground. Exhale when you leave the ground, land on your toes, focus on your toes, tighten your pelvis, and inhale when your feet follow the ground.