There is an important difference between weight cutting and weight management, and I'd say they represent two very different kinds of mental strength. Weight management is keeping in good shape in between camps – weight cutting is the dehydrating and extreme dieting that takes place during the week before the fight. Look at Hendricks: he's able to push his body really hard, hard enough to end up in the hospital at times. His problem is he baloons up between camps, forcing him to undergo extreme cutting. Someone like Bisping or Cerrone who stays in great shape year round has far less demanding weight cut. Then there are of course fighters who do both things, like Conor at 145 or Kenny Florian back when he did his best impression of Christian Bale in the Machinist.