That sounds exactly like what I have. It doesn't hurt all the time. Days can go by, and I'm fine. Then, unexpectedly, I'll be sitting there and it's like my muscle gives a little sprong! It doesn't hurt when I walk. I come home a bit tired, as I'm doing between 3 and 7 miles when I walk, depending on the route. I don't really think of myself as a particularly athletic person, so expensive shoes haven't really appealed to me. But I thought it might be the shoes when I couldn't remember when last I replaced them. I usually think to do it when the bottom splits or wears away. I'll try some new shoes and see what happens.
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