This exercise will improve your range of motion and flexibility throughout your calves and ankles.
Lie on your back and hold the back of your right thigh with both hands. Extend the leg up towards the ceiling to feel a stretch in the back of your leg. Keep the leg extended as you point and flex your toes. Repeat 10-15 times on each side. Then perform ankle circles clockwise and counterclockwise for 10-15 repetitions each way.