Instructions

Secure a light powerband to a sturdy object behind you, such as a squat rack.
Lie on your back, holding the band with both hands directly above your shoulders or chest. Raise your knees to a 90 degree angle over your hips. Engage your core by pushing your lower back into the floor.

Keeping your arms stationary, bring one heal down to the floor. Return the leg to the starting position and repeat with the other leg, keeping the core engaged and the back flat throughout.