it calls for arm strength more than anything. These are my usual steps:

1. Get down on all fours and place the top of your head on the ground.

2. Place your hands on the floor, almost as if you were about to do a handstand (you’ll find the best position)

3. Slowly raise your feet and legs up, pushing against the floor with your hands.

4. Hold for as long as desired. Your forearms should be sort of perpendicular to the floor.