Progressions

1. Two leg heel raise

If you cannot tolerate a single leg raise to begin with you can use two legs to raise up and lower down. 

2. Single leg heel raise

Once tolerated a single leg raise inceases load. Use a stick or wall for balance. 

3. Single leg heel raise with progressive weight

As load tolerance improves on single leg raise a gradual increase in weight is used. Use a stick or wall for balance.