Sitting board: there are two kinds. The left sitting step is that the right leg is in front and the left leg is behind, so you sit cross-legged; The correct sitting step is that your left leg is in front, your hind leg is in the back, and you sit cross-legged.

Requirements: the left sitting board is the right leg to support the center of gravity, the left leg is vacant, the toes are on the ground, and the knees are squatting. The right sitting board is the left leg to support the center of gravity, the right leg is in the air, the toes are on the ground, and the knees are squatting.