Loop a long resistance band around a secure anchor point close to the floor. With your body parallel to the anchor point, and ensuring a good distance between yourself and the end of the band, come into a half kneeling position with your left leg elevated. Place your left leg into the other end of the resistance band and position it just above your knee joint. There should be a good amount of tension on the band. This is your start position. Resisting against the band's tension, drive your knee outwards as much as possible whilst still keeping your left foot firmly on the floor. Hold this position and repeat several times before performing on the opposite side.