The correct way to stovepipe:
Action 1: buttress stretching
1. Stand with your feet slightly open and your palms pressed against the wall.
2. Open your feet back and forth, bend the front of your knees and lean forward. Keep the heel and head in line. Don't leave the heel behind, be sure to stick to the ground.
Action 2: Stretching in Sitting Position
1. The drafter sat in a comfortable seat with his right knee bent and his right foot held by both hands. Through the contraction of leg muscles, make feet and toes as close as possible to the body.
2. From the starting position, try to keep your feet away from your body. The soleus muscles contract for 6 seconds with the same length, then relax and take a deep breath. As you exhale, the leg muscles contract again, making your feet move in the direction of your body and strengthening the stretching of soleus muscles.