If I have to hold a position (planks) or do some exercises (Dips, pullups), the associated muscles shake a lot. Is this normal? It's kind of been something my body has done my whole life when I tried to workout, but I'd like to fix it cause it's annoying.
It totally happens to me too, particularly during planks or upper body exercise, and certain yoga poses too. I think it's your muscles starting to fatigue, though I know it doesn't necessarily feel that way.
I think once you build up enough strength in that position though it should go away!! But I'll bet if you keep pushing yourself to do more and more it'll come back