The biomechanics of the foot have a very significant role in preventing injuries to the lower leg region so a Podiatry assessment should be sort if you have concerns.
Balance and co-ordination of the ankle muscles is important to maintain good feedback regarding balance so use of a wobble board or cushion will help. If you do not have access to either of these then standing on one leg kicking the opposite leg back and forth and side to side is a good way of improving balance.
Keep the Achilles strong by doing slow calf raises and heel dips with the heel hanging off the back of a step. Three seconds up and down is optimal and around 30-40 repetitions three times a week is a good level for prevention.