LeBron James: Keeping a billion-dollar body in shape

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Mancias has worked with James for 14 years

Previously teamed with Michael Jordan's trainer

Mancias entrusted with James during offseason

CNN  — 

Everyone knows about LeBron James and his fanatical workouts, but not many people know about the guy entrusted with keeping his billion-dollar body in shape.

Mike Mancias would like to keep it that way.

The Cleveland Cavaliers’ athletic trainer has been working closely with the NBA’s four-time MVP and global icon ever since he joined the team 14 years ago.

Along with overseeing drills, Mancias’ duties encompass everything from keeping tabs on James’ diet, to preparing his recovery fluids, to flushing out lactic acid from his body after big games.

Over the years, Mancias has become inseparable from James, who once dubbed him “one of the best trainers in the world.” He has shadowed him during All-Star breaks, Olympic duties and, crucially, his grueling offseason workouts.

“He’s family, and so it goes beyond basketball and beyond anything on the hardwood,” Mancias, 40, tells CNN of their relationship. “He trusts me and I trust him, so it’s all good.”

Cavaliers guard J.R. Smith (L) gets his hand checked by trainer Mike Mancias in practice during the 2016 NBA Finals.

Communication is key

Mancias, who completed degrees in health education and kinesiology before being certified as an athletic trainer, is primarily employed by the Cavaliers with responsibilities towards the entire roster – a point he repeats often during this rare interview.

But the fact that he works with James outside of club duties can be a tricky situation for all parties if mishandled – especially given the enormous stakes involved.

“I think the number one thing is communication,” he explains.

“These teams, these owners, these general managers, they are the ones investing millions upon millions of dollars in these players’ contracts, and so we want to make sure that they are in the right hands of someone with knowledgeable credentials.”

During James’ annual summer workouts in Los Angeles, Mancias often reports back to the Cavaliers’ strength and conditioning coach, head athletic trainer and general manager on their star’s progress, explaining that “all three of those people need to be in the loop.”

“This relationship is 14 years in the making,” says Mancias. “(The Cavs management) know that we are tight, we’re close, and they know that he’s in good hands.”