Set-up: Set-up on a soft but stable surface, with two small, sturdy boxes or large boards on which to place your hands. Make sure you have plenty of empty space nearby. Get into the the handstand position, and make sure you have total balance and stability before beginning the movement.
Movement: Lower yourself as far as you can under complete control, then reverse the movement. The goal is to lower your head past the point of a traditional handstand press.
Emphasis: The key to the handstand push up is control - do not exceed a range of motion you can control.
Muscle Roles in hand-stand push up - hands elevated