I also think that you could probably go back historically and make the case that Joe's biggest success has come when he is in his best shape, whereas the slumps in his career correspond to him not taking fitness as seriously.
Of course, in reality it's probably the egg before the chicken here, that Joe stops caring enough to BE in shape when he's not getting pushed, but hey. <_<
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Thank you, Eddie Guerrero.
http://www.wwe.com/f/styles/photo_large/public/photo/image/2012/04/33_Moscow_04112012jg_02128.jpg