But whatever the evolution, the same few suggestions continue to do the rounds: eatright, exercise more, drop stress and allow the body to do its thing.
"When you're number one in the world, the smaller fights don't mean anything so you're not going to do the proper training and eat the right food and do the right things, " said McCullough, a former bantamweight world champion.
And as difficult as it is to try and keep up what I try to do on the road, like occasionally exercise and try to eatright -- it's tough when the easiest food is pizza -- I just believe so strongly in who we are as a nation.