Shit I was giving you a good CC and the computer just turned off :/
This stick have huge legs, you'll have to do more tests to find the good pose to make it look right.
When you plan do the stick running without do he leaving the screen I think that is better you apply the proper spacing until he reach the middle of the screen and after that you move only some pixels to do not give a static lazy look, so you'll be able to give more focus in the poses and flow then the spacing at this moment. The back arm goes back just a little, you should move it more, because will look better and give a more speed feeling. The leg shouldn't have the knee so high I guess or is just the huge leg that give this look.
The roll was well done, nothing to add but I disliked that he stay in the same speed as before the roll, you should do him getting the speed lost while doing the roll.
Overall good job
This actual run have the same problems that I mentioned upper but the back is more higher and it looks better imo, but still some details to redo. The first flip should have more flexed back and legs too, after that the animation goes fine and the stick fall sudden, you should make the events more clear for who is watching, he was going to do a movement and failed right? but you should give a reason of why he would fall like that while just running and trying do a new movement.
That's all for now man, I'm trying improve my run too and I'm getting there I think, so I'll post this recent animation from me with run that might help you. I did in this animation everything that I said to you in this comment.http://yourimg.in/m/683g06p.piv
Good luck man