June 11, 2015 03:15 PM

There are those who have the motivation to hit the gym before dawn, and then there are those who are BFFs with their snooze buttons. Salma Hayek falls into the latter camp.

“Some people have the discipline to exercise in the morning, and I didn’t develop that,” the 48-year-old actress admits in this week’s issue of PEOPLE

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In fact, because her schedule is so hectic — she usually works at least 16 hours a day — Hayek rarely squeezes in a gym session. “I don’t have time to exercise. I am working,” she says. “I’ve had some 20-hour days.”

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So how does she manage to stay in such great shape?

“I work with a woman in London who taught me how to hold my body in a way where the muscles are activated all day long,” Hayek confesses. “So even when you brush your teeth, you’re working the muscles.”

But walking around with activated muscles 24/7 sounds exhausting! “It’s restorative yoga,” she explains. “She taught me to tone [my muscles] without clenching them. You relax them and focus on the parts that need to be used, but never with tension. If you’re aware of your body, you’d be surprised by the effect it can have.”

For more on Hayek’s workout regimen and beauty routine, pick up the latest issue of PEOPLE, on newsstands Friday.

— Lindsay Schallon

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