From this New York Times Magazine profile of Brady... http://www.nytimes.com/2015/02/01/magazine/tom-brady-cannot-stop.html

While Guerrero is known as Brady’s “body coach,” that label significantly understates his exhaustive reach into Brady’s life. Guerrero is his spiritual guide, counselor, pal, nutrition adviser, trainer, massage therapist and family member. He is the godfather of Brady’s younger son, Ben. He accompanies Brady to almost every Patriots game, home and away, and stands on the sidelines. He works with Brady’s personal chef to put together optimally healthful menus; he plans Brady’s training schedule months in advance. Above all, during the football season he works on Brady seven days a week, usually twice a day...

Guerrero, 49, is a practicing Mormon of Argentine descent with a master’s degree in Chinese medicine from a college in Los Angeles. His philosophy is built on three components: “We work on staying physically fit, emotionally stable and spiritually sound,” he says. He can sound somewhat Stuart Smalley-like in his mantras. Guerrero shares with me a saying that he and Brady invoke a lot: “Where your concentration goes, your energy flows and that’s what grows.”