Why do your muscles shake during a workout

At some point, you’ve probably been in the middle of an intense, or not so intense, workout when suddenly it feels like your legs or arms are about to give out and your muscles start to shake uncontrollably. Most people figure it’s due to their lack of strength or stamina. Have you ever wondered if there was more to it than that though? Here are a few reasons why your muscles shake when you’re working so hard.