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The following three poses are recommended ways to sit so that you can reduce lower back strain, discomfort, and pressure. Seated on the floor: To help keep the spine straight in any seated position, sit with your entire back -- from shoulders to tailbone -- resting against a wall for support. You may also wish to sit on a firm cushion or folded blanket to help keep the spine straight. Excerpted with permission from The Prenatal Yoga Deck: 50 Poses and Meditations (Chronicle Books), by Olivia Miller, with Diane Philos Jensen. Medical Consultant: Dr. Maryanne Clasby Bombaugh, OB-GYN.