Gym, core
Balance on one forearm and the side of your foot, body in one straight line.
Best on camera: a slow, steady move with your joints in clear view.
Phone at hip height, about 3 metres away, facing you.
Your whole body, head to feet, needs to be in the picture. The coach will remind you if it can't see you.
Hips dropping
Push your bottom hip up towards the ceiling.