That exercise you’re referencing, in particular, has a lot to do with core strength, so if you don’t have a strong core, you’re more likely to experience the shaking as your muscle tries to perform the exercise. You’ll notice the more you do it (aka the stronger you become) the less your muscles will shake in those instances.
My 7th grade teacher taught me this so I could be wrong. Your muscles are made up of lots of fibers. If you used all your fibers at once, it would be way to much force and rip your muscle so your brain doesn’t let you (in extreme cases you can ex. Pinned under a car). When you’re muscles are doing work, only use some of them. If those fibers arnt strong, they “get tired quickly” and then the other fibers have to contract and they switch back and forth causing the shake
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