
standing wall-supported calf stretch with posterior leg externally rotated and knee extending to release tension
Stand facing the wall and put one leg forward, bend forwarded knee as in lunges along with lean on wall and rotate the foot of behind leg outward( affected leg). Feel for the strech on behind leg over the calf. Release the stretch by knee straight.
Nothing here is a prescription. Your physiotherapist decides which of these are yours, and when.