I did a pretty intensive leg workout and decided to take the next day off for rest. I definitely had some lactic build-up the next day and my legs were slightly sore. However, when I woke up on the second day, my legs were even more sore then the day before. They aren't sore enough to worry me, I've had them this sore after working out, I'm just wondering if there is an explanation for why a muscle could be more sore after resting?
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It is common for muscles to be more sore two days after a workout, rather than the next day. The phenomenon is called DOMS: Delayed Onset Muscle Soreness. Sometimes it manifests the next day after working out; sometimes it crops up after a day's delay.
As Mark Sisson notes, we don't really know what causes DOMS physiologically: