I about failed my high school physical today for next year's sports because my ankles are too weak. I have already gone through rehab on both of them for very serious sprains and numerous torn ligaments. I have had x rays on one of them and missed over 2/3 of my soccer season last year. What are simple ways to excercise my ankles? I already have bands to work them with and i balance on a pillow for strength but is there anything else i could do?