Robots are coming to take your jog. Or, at least, your walk. Each spring in your step costs your body calories. Robotic assistants could help ease fatigue for people who earn their living on their feet—or who have been hobbled by disease. But many robotic exoskeletons are so bulky that they actually cause wearers more fatigue.

Learn about your ad choices: dovetail.prx.org/ad-choices