Cool little anim!
I can't help but feel the table and shadow moving down 1px with the hammer hit ruins the weight of everything. It'd make more sense if the table/shadow stayed in place and then the recoil of the hammer hit makes the table pop up a pixel or two before falling back in place. Also some subtle movement on the sword itself would be nice.
Also agree w/ the arm bending backwards. If you try and bend your arm back, the elbow can only rotate about 90° perpendicular to the head and neck. Any further and you'd most likely dislocate your shoulder.
Thanks, I will remember for next time (pj seems a tad behind when updating preview thumbnails so I'll leave this one for now) 
Very nice...
but I think that arm bends backward too much (apparently it seems not to be lifted above his shoulder but below, before striking) 
This is amazing, but I suggest using a defferent frame for the preview. The frame you selected works best in the animation, but it might look better if you used a smoother fframe for the preview.
The legs and feet under the table are the most smoothly animated and well done part, lol.
Noted. If I get back around to this, I will make the necessary changes
Thanks!