Erin - need way more info as to where it is. If he was prescribed Naprosyn for his tendonitis, he most likely went to visit his friendly family physician for sure ;)

If it is along the inside ankle bone (wild guess of mine) - google posterior tibial tendonitis. If behind the outside ankle bone - google peroneal tendonitis. I'm assuming you know what the achilles tendon is. If neither of these places, let me know where. In general, the best way to get rid of ANY tendonitis is to simply NOT USE the tendon/muscle/action. It is both that simple and that hard. THEN find out what caused the tendonitis or a lovely revolving door awaits ...

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Fatigue is biochemical, not biomechanical.
- Andrew Coggan, PhD