When JJ was the head coach in Miami he would work the Dolphins to a pulp in the off season and preseason. Every year the Dolphins would start out 6-0, 7-0 and 5-2 and then they would filter off like they were tired. IMHO Jimmy Johnson overworked the Dolphins and made them hit the wall to early in the season.
Just because a head coach works the **** out of their team in the off season don't make it correct. You have to run a marathon not a sprint in the NFL.