HOW: Begin on your back with your heels resting on an elevated surface and with a slight bend in your knees. Raise your hips up off the ground and bring one knee towards your face. From here, rapidly drive that heel down towards the elevated surface as you drive the opposite knee up towards you. Keep your hips elevated during this exercise.
FEEL: You will feel your hamstring muscles working as you work to alternate your legs with this exercise.
COMPENSATION: Keep a slight bend in your knees as you perform this to better target the hamstring muscle. Avoid letting your hips sink towards the ground with each switch of the legs.