This seated spiral twist will strengthen and stretch your spine, but a common mistake is to round your back, which causes your chest to cave in. If this happens to you, try elevating your hips on a yoga block. You will find it easier to sit up straight and perform the exercise correctly.
Sit cross-legged on a yoga block or on the edge of a thick blanket with your right leg in front. Rest your hands on your legs. Inhale and lift your chest, pull your abdominals toward your spine and relax your shoulders down and away from your ears.
Voight is the creator of a line of fitness DVDs, including "Full Body Stretch" and "Ballet BodySculpt."