Ashton Kutcher is gracing the February cover of Men's Fitness magazine -- and he's spilling all his workout secrets -- and why he has to stay in such great shape.

ashton kutcher

"I stay fit for no other reason than to save the people I care about," said a cryptic Kutcher.

The actor jogs Runyon Canyon near his Los Angeles home one day a week with wife Demi Moore. He also endures hours of hot Bikram yoga, pretending he's in the desert with no water.

"All of my physical fitness regimen is completely tailored around the end of day," he told the magazine.

For more of Ashton's interview, pick up a copy of Men's Fitness on newsstands now!

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