This movement is performed simply on a block and your body weight.
Stand on the block with only your heels. Grab onto something sturdy for
balance.
Be sure to have your knees slightly bent. With your heels on the block, lower your
toes as low as you can, feeling a stretch in the front of your lower leg. Now, lift
up your toes as high as you can, contract.
Slowly lower your toes back down to the starting position and repeat the
movement.
Tips
If you find it too easy to do the suggested repetitions, keep doing repetitions
until you cannot do any more.