Hi doctor. I just removed my cast about a week ago. I've earlier fractured my 5th metatarsal (pseudojones) After the removal of the cast I was advised to walk. But I feel twitches in my heel and the sole of my foot while walking and it hurts. It scares me from walking as I am afraid I might break one of my bones while stressing the leg. What do you suggest as the best exercise to strengthen my leg muscle?