This is how HAL works in a nutshell: Hop in, move an appendage slightly, and the suit detects the movement. After that, it guides your natural movement, but with robotic efficiency. So if you're a senior citizen that has trouble getting around, you can move your arm slightly and let HAL help you reach the top shelf. It's powered by a 22-pound battery attached to the waist, and the leg braces can help the wearer walk, and even climb stairs.