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Lie on your front on a firm surface, with your hands under your shoulders, palms down. Look up and push up, lifting your head and shoulders up with your arms. Keep your hips on the floor. Hold for a count of 5 and then gently lower yourself back down. To start with, you may not be able to lift your shoulders far. As you become more flexible, work towards trying to straighten your arms, still keeping your hips on the floor.