*Ahem* Inertia is actually the ability of an object to resist change, be it from rest to motion, or from motion to rest.
That means the sticks torso (actually anything above the foot) will have to move forward (to varying degrees. The head will move the most, shins the least, that kinda thing.)
Also, in my opinion, the crouch was fine.What needs to be worked on, is stiffness. Its everywhere in your animation. The sword looked like it was copy-pasted into every frame, without even rotating it slightly. During the run the feet seemed glued to the ground until the next foot was put forward. That generally isn't a natural run. The ending pose didn't have enough easing to it, and once again the sword seems very incidental to the whole process instead of being a real part of it.
Moar physics. The movement of a jumping person or actually any object launched into the air tends to be more of an arc than a *coughcough* triangle.
Resizing. 'Nuf said
You need more in-between frames in the air. While it might be harder than simply adding a blur, the result is far more satisfying.
