Our expert says:
Maybe a bit of weakness in the muscles and tendons, which is exaggerated when you walk in heels, because then the calf is placed into a "weakened" position. The fact that there is some stiffness suggests that there is some damage there now, perhaps caused by this, rather than being the cause.
Obviously, avoid heels for a while, give the calf some time to recover, otherwise you'll just stay in the same situation. And then maybe you can work on the strength of the calves. You can do this using single-leg heel raises. Stand on the edge of a step with your heel over the edge. Raise your whole body up using your ankle and calf muscle. you will probably feel some strain in the calf. Do this 10 times on each leg, and perform 3 sets during the day. If you feel pain, then stop. This type of exercise has been found to be successful in treatment of achilles tendinopathies. However, you must remember to stretch very well, and to take as much strain off the tendon as possible.
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