The big question here: Can tendons be strengthened, similarily to how muscles are strengthened? Can you train them, put the under resistance of some sort, and they will become stronger? For example, an exercise I do to recover from my ankle sprain is stand on the affected foot while tossing a ball in a circular motion. As my ankle fights to keep me balanced, is it becoming stronger over time from this exercise, or does the tendon only become more flexible? Sub question: I have tight achilles tendons from my sever's disease, as well as a side-effect from my right ankle sprain. What exercises can I do to 'strengthen' my achilles?