I've been practicing Karate for a year now (age 50) and recently injured both feet on the balls of the feet. The injury started after an intensive training session involving jumping up and down on the balls of my feet while in a sparring stance. The pain feels like a red hot knife being stuck into my feet, its very intense when it happens and now it usually comes on when doing a 180 degree step in a kata or similar. My doctor says because of my adnormally high arched feet the bones under the ball has punched into ligaments causing this pain, and I must give up Karate. Anyone had this problem and found a way out of it? is there a way to toughen the feet for this problem?