That's nothing. I'm in NY and was in the subway watching some street dancers. This guy was basically doing those, but much slower, then also one leg at a time, to the beat of the music and his legs NEVER touched the ground. He held his body in an elevated plank the whole time. Then pulled both legs in and pushed up to a handstand - then in that position he started doing push-ups!! It was insane. Did I mention he was on concrete, not carpeting? I've never seen anything like that outside of high-level gymnastics. Actually, very similar to that second video posted. Needless to say, the guy was seriously ripped, but lean. Very impressive.