I second OW's recommendation. I tore two ankle ligaments a year and a half ago and after 8 weeks of no running at all, I did my first fell run and later a race using one of these. It gave me blisters though so I didn't use it for very long and swapped to a neoprene ankle support which I think gave me more confidence than actual support. I gave that up as soon as I could and throughout my rehab I did lots of physio exercises and wobble boarding. I agree that a wobble cushion would probably have been better but I'd already bought the board and I have good balance from years of tai chi so I stuck with it. Could do to use it more often.