Keep your non-kicking leg bent at the knee, or as others will say keep it flexed. Point your non-kicking heel in the same direction as the kick, as someone has pointed out. Also, keep your body tight, meaning arms in close to the body, kicking knee chambered in close before and after the kick. Utilizing of a wall, chair or training partner is also good to work balance. All in all good advice from all. Hope this helps