Everyone's favorite headless bipedal bot is back, just in time for Halloween. Petman won't be riding any horses around Sleepy Hollow, though - just showing off his moves on a treadmill. Boston Dynamics is developing Petman to test chemical protection clothing for the U.S. Army, and if he's joining the army, obviously he needs to get in shape. Watch as he plods along, with an impressively smooth gait, balancing himself when someone pushes him. He's also got a few new calisthenic exercises up his sleeve, working those glutes with some squats and lunges, then executing a far better push-up than any I've ever done.