SPORTS: The Champ | Floyd "Money" Mayweather for ESPN Magazine: mayweather_0009

LAS VEGAS, NV - JULY 26: Mayweather goes through a medieval neck workout as Mayweather Promotions CEO Leonard Ellerbe guides the weight, his uncle John Sinclair (right) watches and an assistant holds his legs. (Photo by Benjamin Lowy/Reportage by Getty Images)

LAS VEGAS, NV - JULY 26: Mayweather goes through a medieval neck workout as Mayweather Promotions CEO Leonard Ellerbe guides the weight, his uncle John Sinclair (right) watches and an assistant holds his legs. (Photo by Benjamin Lowy/Reportage by Getty Images)