Drawing frame by frame animation is REALLY HARD, but it gives me an appreciation for the animators of the old days. This obviously isn't finished, but as a practice and considering I haven't done this in YEARS, It's not bad.
Why the ball with legs? Well my animation background is technically 3D animation and I've seen tests like this in 3D where they have simply a ball with legs rigged and ready to animate and you have to make it seem believable. That was the basic concept with this. The walk run cycle is very difficult so being able to master that shows some skill. Not me though. I have no skill for this...