Any food I could eat that would be supplemental?
No. Just a regular in take of calicum and iron.
And do not go for the herbal remedies/suppliments that claim to strengthen joints and bones -they are usually useless.
If so wished, I's could go through my's journals and manuals to see what Grandfather recommend.
As for you exercises: replace the pole with a short iron bar and do the same.
To Kulli: For your condition, Horse Riding Stancing is useless, puts too much pressure on the ankles and weakens them further.
Unfortunately, there is practially nothing you can do about your condition. You are better off stretching and strengthen the tendons in your shins and ankles to prevent collapse. Also, by a pair of ankles supports/bracers for when you start to work out.
The worst thing about ankles is that if they are broken once they never recover and are oft to break again and again.
Best of luck to thee.
Peace
The Pimp NeonBlack