Good blinking!
That amount of torso motion shouldn't create so much breast movement. The movement itself is well-animated, just out of place.
The bellybutton's movement feels a bit strange to me. Maybe subpixel it, have a dark-shadow trail of sorts? It moves too much.
The arms look stiff, try giving them a little side to side motion, with more movement beneath each joint (a little in the upper arm, more in the lower arm, even more in the hand). The looser the arms, the more they'll swing in this kind of motion. If they're meant to be stiff and battle-ready, then perhaps add a little bit of motion from the elbows down, have her bring her fists forward a little. A little swinging there will also make her fists feel heavier.
Forgot to add this to my previous post: If you're after realistic proportions rather than "heroic" ones, you should make her head larger as it's very small, and perhaps also shorten her legs a bit. On a real person, the crotch is approximately halfway between the top of the head and the soles of the feet. If you're after more stylised proportions, this is fine.
