Our expert says:
Like I said in the previous reply, it's usually that the muscle twitches, because the nerves that control it cause that reflex twitching. It happens to tired muscles, and people who have walked downhill for a long time will know all about this. It's nothing to worry about - as I said, it's not the muscle burning fat, it's just a twitch in the muscle caused by fatigue and a temporary 'dysfunction' in the nerve control of the muscle.
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