One of the issues of playing man on every play is just the amount of energy it takes,” said Belichick. “I mean you have to run with the guy 30, 35 yards on a running play because he’s just running you off. It’s really a nothing play for the corner, it’s an inside run, but you don’t know that. You’re in man coverage, the guy runs a go route and you gotta chase him for 40 yards and the ball is back there 40 yards behind you at the line of scrimmage, but you don’t know that. So to do that every single down, is it doable? Yeah. But is it taxing on your secondary to do that, it really is.