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Tuck and Roll
You probably will want to save this one for your living room floor, as office co-workers may stop and stare. Lie down on the floor, bringing your knees to your chest. Now, gently roll back to shoulder blades and tuck chin to your chest as you roll upward. By gently rolling on your back, you will help increase blood flow to the muscles around your spine and to your internal organs. It's like a somersault when you were a child, so you might even have some fun.