As long as you stand up straight, you will have the motivation to push the wall forward, and your legs will naturally be on the water.

Practice method:

Open your feet, relax your arms and straighten forward. After inhaling deeply, lean forward and bow your head. Gently push your feet off the bottom of the water and float on the water in a prone position. Your arms and legs are naturally separated, which requires you to relax and fully expand. When standing, tuck in your abdomen and legs, press your arms down, then stand with your head up, your legs straight and your feet touching the bottom of the water.