Practice Animating an Axe
Need Massive CNC I know it has a lot of flaws you can spot.
http://www.fileize.com/view/3187d664-5d8/

it looks choppy instead of double framing at the start try to add more frames

I did a lot double framing not just at the start but at the middle and end at fps at 30.

try double frmaing less and adding more frames instead

I did there call end between frames

It looks as if the axe has no weight. Try to slow it down a bit when it reaches the top.

A bit too much double framing. Add more frames. ANIMATE more

You need to add some physics to it aswell as fluidity , i my self had trouble as well when i started working with weapons but you star getting use to it also add some nice trails and speed to it.

The axe looks weightless and the animation is choppy when he lifts it. Just add more frames with easing into it, and keep in mind the axe is a HEAVY weapon, so attacks should be deliberate with a LOT of force behind it. And remember: Take your time, ONE AT A TIME. Animation is no race, and if you are not afraid to go back and change something if it doesn't look right, you will find MASSIVE improvement in your skill. Keep it up! :)

You need to make it smoother, try adding more frames, also you need to add anticipation to your movements, especially with the arms.