Obama trainer: President 'believes in raging against death'

President Obama’s personal trainer says the commander in chief doesn’t mind breaking a sweat.

“He believes in raging against death at this point,” Cornell McClellan tells TMZ Sports of the 53-year-old Obama. Calling him “an overachiever,” McClellan added of the executive mansion resident, “He likes to be pushed hard, and I push him hard.”

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According to McClellan, Obama’s not the only one at the White House who doesn’t have a hard time clocking in at the gym. He says the first family “love to work out so much,” making the fitness guru’s job “very easy.”

In case there’s any doubt about the status of Obama’s abs, McClellan adds with a smile, “the six-pack is intact.”