Michael Phelps, the undisputed King of Swim for many years, retired after the London Olympics, 2012 and took up golf. "Loving golf, made 150 foot putt today". And by marching around the golf buffet tables he took on 25 lbs of body weight.
Now he's sick of fat and can't shoot par so is working out with an eye towards the next Olys, in Rio, 2016. He will need to work damn hard so succeed, IMO. But, working hard to regain self-respect is worth doing well and i wish him the best of conditions, in and out of the pool.