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After a grueling CrossFit workout on a hot Summer morning that involved kettlebell swings, goblet squats, and about 100 walking lunges, my lower body was toast. But what was weird was that my left glute started twitching that night and continued into the next day. It didn't hurt at all, but it was annoying! Has your muscle twitched after working out? Here's what you need to know. What Causes a Muscle Twitch? A muscle twitch, or sometimes referred to as a fasciculation, is a short, involuntary, unpainful contraction of skeletal muscle that may happen repeatedly, explained orthopedic surgeon . . .