Systema Spetsnaz Russian Martial Arts DVD - Powerful Joints - Martial Art Instructional DVD for Joints Flexibility in Hand to Hand Combat Training Develop joints and spine flexibility which are extremely necessary for hand to hand combat training Strengthen back and stomach muscles, remove calcium deposits, normalize your nervous system Cleanse your internal organs - liver, heart, spleen, lungs, and kidneys Relieve stress, open your energy channels and rejuvenate the entire body This Russian Systema DVD that will benefit all martial arts styles and all self-defense systems