ESPN Video

With just a pair of jeans, a T-shirt and two bare feet, Dean Potter walks high above the earth on a tightrope, without a harness. Free diver William Trubridge uses his body, two bare feet and one breath of air to plunge hundreds of feet down into the world's deepest blue hole, and back up again, holding his breath for more than 4 minutes at a time. Before there were astronauts, there was Joe Kittinger, who in 1960 tried to become the first man to jump from the brink of space -- 20 miles above Earth, from a weather balloon. These three world record-holding athletes exemplify the amazing feats that man can accomplish when he risks it all -- on land, in the sea and in the air.