Calisteniapp

Stretch one leg while doing a deep squat with the other, so that your buttocks brush the ground and without lifting the heel at any time

When you are down with the leg fully flexed you stand on your toes for a second to contract the calf

Come back up to complete one rep

To make the exercise a little easier or if you find it difficult to maintain your balance, you can try doing it on a floor that has a certain downward slope or with some weight in your hands, placing them in front of your chest.