. >> this is exo's headquarters, where the magic is made and pereffected. robots like -- perfected. here robots are put their their paces giving those paralyzed a chance to do what they were told was not possible. nathan is a cofounder and an inventor. it was developed for the battlefield, as a device to help distances. >> there's a problem in the u.s. military with soldiers getting injuries through large loads they carry. we were helping to develop exoskeletons to carry the back back and the weight of a vest. the breakthrough was creating a robot supporting its own weight with the minimum of energy, meaning it could be powered by a battery pack. then there's the walking thing. it takes over the muscle function. it can do that completely for a person par leased below the race. or partially for someone who is learning to walk. >> reporter: the only thing i step. >> reporter: like amapped -- amanda, jason is a tester. >> i put it into step. if i stop and don't go to the next position, it stops. i can go forward and lateral. there we go. >> test pilots like amanda and jason - how did t