Strangely enough, I have an easy time drawing hands dynamically, but I'm the worst at drawing a static boring hand. So my characters always have over dramatic hand gestures, cause static hands and I are not on speaking terms.
I also struggle drawing shoulders when they're moving up toward the face, I always feel like I either draw them too small, making the head look giant, or too wide, making them look just....incorrect. Why are shoulders so weird when they move???