You’re wrapping up a morning run when one of your hamstring muscles balls into an angry fist of pain. Or it’s the middle of the night, and a sudden spasm grips your calf and forces you out of bed…
You’re wrapping up a morning run when one of your hamstring muscles balls into an angry fist of pain. Or it’s the middle of the night, and a sudden spasm grips your calf and forces you out of bed…
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