stretch after workout

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Stiff hip flexors (which can be caused by sitting too much) can lead to lower-back pain. Help prevent the progression by stretching them daily, like Brooke Marrone, a New York personal trainer and the founder of Brooke Marrone Fitness, does. "My hip flexors are supertight, so I stretch them no matter what kind of workout I just finished," she says. Her go-to move: Kneel on the floor and place one foot out front with your knee bent at a 90-degree angle. Then push your hips forward, keeping your front knee above your front foot, hold and switch legs.