Some fighters let themselves go after retiring. Why do you think this is? Is it because boxers have to go on a strict diet to make weight? And who were some fighters who got fat after retiring?
https://s14.postimg.org/dq65cwi35/qidq0cucmb7be5cct9ir.jpg
lets be real here ... tyson is back in great shape
https://i2-prod.mirror.co.uk/incoming/article6464774.ece/ALTERNATES/s615b/Mike-Tyson.jpg
Just lazy by nature and probably never liked working out, so when they aren't fighting anymore they eat and get fat.
https://pbs.twimg.com/media/DJvpHfoUMAAveZq.jpg
Unbelievable that he still has a six pack. Very impressive.
yeah man, if you're sitting on bank, and your entire life/career has been to stick to a strict diet and every1 says the hardest part is making weight.. then yeah, its a no brainer really
but then again, some guys stay in mad shape - i.e. nigel benn comes to mind