You can do standing calf raises on both legs or on 1 leg and each variation give you a slightly different feeling. (best-leg-exercises.com)
Sit in a seated calf raise machine with only the balls of your feet on the platform (heels in the air) and your knees above your ankles. (shapesense.com)
1 Single leg calf raises Stand on a sturdy step so that the ball of one foot is on the edge and your other foot is lightly crossed behind your ankle. (fitnessandpower.com)