Such as when you’re on your back and have to lift your leg straight in the air.
Personally from the knee down if I try to go straight up or towards my body, the leg shakes uncontrollably
In: Biology
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.
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