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You didn't go to the gym.

One patient visited Few recently and confessed that after skipping her workout, she didn't look as vibrant and awake as usual. There's a reason for that. "Exercise increases the microcirculation in your face, which helps improve moisture in the skin. People generally look younger after they've worked out," says Few. Without exercise, you may appear pale and deal with dull skin. Even better are the long-term benefits: Regular endurance activity helps prevent cellular aging in the skin, finds 2015 research on animals and humans, published in the journal Aging Cell. You don't need to lock yourself in a gym, either. Few recommends 20 minutes per day.