Instructions
Lie on your side on a yoga mat or other soft surface with your lower arm bent and comfortably supporting your head and neck
Bending at the knee, bring the foot on your upper leg to rest, sole-down, in front of the thigh on your lower leg, use your free hand if necessary
Brace your core and make sure your body is nice and straight
Slowly lift your lower leg up and off the ground by a few inches, keeping it straight during the exercise
Slowly lower your leg to return to the starting position