Looks like you have been doing this awhile, has this always been the problem or just recently? I had a bit of tightening when I first started, but have worked hard at warmup and only moving up when ready. So after first getting my legs working right, I really haven't had any issues ever since. That being said, if I don't run for a couple weeks(such as being on vacation, etc), I do have to back off a bit and do find my legs can be a bit tight at first. But after a couple runs, my legs are back to having no problems.
I do eat bananas and take a potassium supplement and try to eat many good foods to keep the potassium up.
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