Left leg(I'm a south paw and always kicked footballs/soccer balls with my left) is fine. I can get it pretty high and whip it at the knee and hit hard. But my right, I can barely hit with my shin to their shin area...it's horrible. I could hit high up if it was the side of my leg, but I want to hit with my shin, obviously. any advice on getting my right leg up a lot higher? stretches? exercises? technique?