I read a Frederic Delavier’s book « Strength Training Anatomy » and I learned good stuff.
Standing with your hands on your hips. One leg forward with your knees stretched and your feet in the knee axis :
Flex the knee of the front leg while advancing your pelvis. Be careful to keep your back leg straight and keep your heels on the floor.
Keep this position to feel the stretch of the back leg.
This exercise mainly stretches triceps surae (composed of 2 gastrocnemius and soleus), flexor muscles of the toes and tibialis posterior. This exercise stretches a little bit long and short fibular.
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