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Boat Pose is a balancing posture that strongly works your core. Your hip flexors and quadriceps are engaged to lift and hold your legs in the air, while your abdominals stabilize the pelvis and torso, keeping you from falling over while in the pose. The adductors are also engaged to keep your legs parallel.
Sit on the floor with your knees bent at a 90-degree angle in front of you, feet parallel and facing forward. Rest on your tailbone and place your hands down by your hips, fingers facing your heels. On an exhalation, press down into your hands and rock back slightly, with your feet about 10 inches off the ground. Keep your back straight and lengthen through your torso.