Oh man I don't even think I could run if I saw that I'd be scared stiff!
He looks so intimidating now with the extra bulk
A few issues I would try to fix:
1) his left forearm is a little long and the hand awkardly twists to face the camera/floor rather than following the line of the arm (possible but odd).
2) his left foot is a a tad bulky, I would try to slim it just a touch on the front part to make him look faster.
3) his right leg could tweak the muscles and knee a bit better, plenty of comic references available for that.
4) the rear highlighting could use a bit of extra illumination or maybe just some touches of whiter highlights?
5) his right bicep and elbow is pretty good but I think you can sculpt it a bit better
6) Ya gotta make his eyes glow a bit!