Note – you may need to wear socks to execute this exercise. Sit against a wall with your lower back glued to the wall, shoulders relaxed, hands and feet planted on the ground. Flex your feet, then gently slide your feet out until your legs are fully extended. Focus on keeping your core tight and belly button pushed in towards the wall. Slide your heels back in to the original position (slight bend in your knees) and do 24 repetitions.