Flying on your belly - that's what starts the path to infinity flight skill.
The best way to control the body in the air flow - the power of thought.
As you walk ,run , do simple everyday movements without thinking what parts of the body need to move.
And in flight - the higher your skill the less you think over the movement.
1) The First thing you need to learn once in the air stream is to find the balance where your body is static relative to the walls and grid
PS How to find balance: