Loop a long resistance band around a secure anchor point close to the floor. Lie face up on a mat with your head facing away from the anchor point and ensuring a good distance between yourself and the end of the band. Place your left leg into the other end of the resistance band, position it securely in your hip crease and bring your left knee towards your chest, clasping your hands over the top of your knee. There should be a good amount of tension on the band. Rest you right leg on the floor fully extended. This is your start position. Resisting against the band's tension, drive your knee in towards your chest as much as possible whilst still keeping your right leg firmly on the floor. Hold this position and repeat several times before performing on the opposite side.