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issue with crunches

mammaminor
mammaminor Posts: 31
in Fitness and Exercise
Hi! I've been doing the 30 day shred program and today when I was doing crunches, each time I came down, my spine (more likely the muscles in my back or my abs) started to quiver. I don't have pain or feel strained at all, I wasn't even getting tired yet, but I was like.. twitching. Has anyone experienced this before? Any advice?

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