Ankle Sprain Injuries and Advanced Tibialis Posterior Muscle Strengthening
Go up on the ball of your foot onto a step with your heel hanging off of the edge. Use your hand to hold for balance. Then line your foot up so your toes are facing forward.
Start by lowering your heel like you would be doing when performing a heel raise for your gastroc portion of your calf muscles but rotate your body inward as you lower your heel into the eversion plane of movement to isolate the tibialis posterior muscle.
When you perform the heel raise add a rotation outwards to get the ankle into the inversion plane to really hit the posterior tibialis. Do 3 sets of 10 reps on each side daily.
After an ankle sprain, strengthening your tibialis posterior muscle can help stabilize it as you progress with any form of running activities, run training or even rock climbing. This can be an important part of your ankle injury rehab.
If you have any pain or difficult doing this exercise, consult your local physiotherapist before continuing.