Woman holding the plank pose

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Focus on Your Core

To counteract the aging effects (such as aches and pains) of sitting slumped at a desk all day, you have to work your core regularly, says Shirley Archer, a mindful living expert and the author of Fitness 9 to 5. "Staying strong through your center improves your balance and posture," she says. Try doing a 30-second side plank on your right and left side, or a set of 10 pushups against the wall. Both activate trunk muscles to strengthen your middle, she says.