Gym, legs
Step forward and drop your back knee towards the floor, staying tall.
Best on camera: a slow, steady move with your joints in clear view.
Phone at hip height, about 3 metres away, filming you from the side.
Your whole body, head to feet, needs to be in the picture. The coach will remind you if it can't see you.
Not deep enough
Drop your back knee to just above the floor.
Leaning forward
Keep your shoulders stacked over your hips.