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I have a question regarding warm-up and splits. This often occurs to me when I perform my stretching routine: I do the warm-up and afterwards the front and side split. That being said, I have a problem. Everytime I do such routine, i always end-up with muscle soreness, mostly in my hamstrings. But, here's the funny part. If I don't perform the warm-up and perform the front splits (not warmed-up) I don't feel any soreness whatsoever. Why do I feel so?