Gym, legs
Hinge at the hips with soft knees until you feel your hamstrings stretch, back flat.
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.
Soft knees, not a squat
You bent your knees too much. Keep them soft and push your hips back instead.
Push your hips back
The hinge was small. Push your hips further back until you feel your hamstrings stretch.