Mark Leibovich writes “Tom Brady Can’t Stop” in the NYT Mag about how Super Bowl quarterback Tom Brady, age 37, has a plan to still be a star in the NFL at age 42-43:

The trip represented a rare separation between [Tom] Brady and Alex Guerrero, his best friend and ever-­present guru for training and many other things. 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. …

“Body work” is Guerrero’s preferred term for his massagelike “technique.” Brady had raved to me about Guerrero when we met in New York. He told me they had started a business together, called TB12, that would institutionalize Guerrero’s technique. The business is in a shopping center behind the Patriots’ home field, Gillette Stadium, but it is hard to describe what exactly TB12 is — not a gym, not a group practice of personal trainers, not a nutrition or massage-therapy center. Whenever I asked Brady and Guerrero to define TB12, they would talk of things like “re-educating muscles” and “prehab” (preventing injuries, rather than dealing with them after they happen). Inevitably, they would come around to the word “lifestyle.” (“Everyone thinks I’m a kook and a charlatan,” Guerrero says, referring to how some traditional trainers view him.) …

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.”

Brady is always telling his teammates to see Guerrero. Many do, with varying levels of commitment. The former Patriots receiver Wes Welker, Brady’s close friend, was a disciple, as is the current receiver Julian Edelman. The linebacker Junior Seau finished his career in New England, where he worked with Guerrero; Brady says Seau nicknamed Guerrero “Mr. Miyagi.”