One of the best ways to improve ankle stability is to challenge the ankle's stability.
Give this exercise a try to see where you are:
1) Grab 4 cones, water bottles, shoes, whatever.
2) Place them in a half circle around you.
3) Standing on one leg - try to touch each of the cones with your hand.
4) Switch legs
Let me know how you do!
Ankle stability can help prevent injuries like: ankle sprains, rolling your ankle on a trail run or while playing soccer, football, volleyball, etc.
And let's be honest - it's kinda fun to try!
Give it a try and let me know how you do!