Chris Robinson catches up with trainer Ronnie Shields at the Long Life Fit Gym in Las Vegas, Nevada in January 2013. Shields discusses his stable of fighters, including the Charlo brothers from Houston and Erislandy Lara, while also speaking on such stars as Juan Manuel Marquez, Nonito Donaire, Guillermo Rigondeaux, Abner Mares, Manny Pacquiao and Floyd Mayweather