It aligns your torso and legs in the ideal posture for good circulation, then moves your legs back and forth up to 4200 times per hour, mimicking a 1.7-mile walk, while you're in that perfect position. It's electric and motorized, so it moves your legs for you as you sit back and relax, much like a physical therapist would. Your mind is entirely free to enjoy your favorite seated hobbies with no willpower required.