A really simple shotokan karate exercise, working on not over turning the hips and body on back kick.
Partner up, or this exercise can also be practiced against the wall. From ju-kamae simply spin and kick ushiro geri, stop at completion of the kick and try not to push onto the target, to hold your balance.
Then return the kicking leg back to the starting position by moving it back the way it came, rather than spinning completely around.
This shotokan karate exercise is great for stopping the over spin on ushiro geri. It is also really good to practice this real slow, as this will develop a really strong supporting leg and good balance.