Supine belly roll: Lie on your back on the mat, put your hands on your chest, fold your chin, bend your knees at 90 degrees, and the contraction force of abdominal muscles makes your shoulder blades leave the ground to complete the action. Exhale when contracting and inhale when recovering.

Lie on your back and lift your legs: Lie on your back on the mat, put your hands under your hips, lift your legs and bend your knees slightly. Lift your legs off the ground when your lower abdominal muscles contract until your thighs are vertical to the ground. Exhale when you contract and inhale when you recover.

The above actions are training methods for the abdomen.