this is jessie burk, the tough mudder, about to finish a foot race, obstacle course in arizona last weekend. the little things hanging down are electroshock therapy. >> what? >> this is the last obstacle you have to get through at the end of running 12 1/2 miles going through 20 different obstacles, taking ice baths, jumping over walls, going through tunnels of mud. >> they are running through this. every time they touch one of those wires they get zapped? >> i'm done. >> a little bit of mud but a real tough mudder licks the mud off his legs. >> licks? >> there you go. >> yes, you pay to do this. >> do you have to pay to do this, or does someone pay you. people would have to pay me. >> people thought they could run through the wires but grown men were getting zapped and dropped to the ground. tell us a little more what it felt like to get through the entire 12 1/2 miles. >> i wanted a challenge. it would be a good way to accomplish fitness goals. >> is one of your fitness goals to get shocked 21 times. >> i was lucky and probably only got shocked eight times. >> only. >> i can say i made it