authority on free diving education he lent his skills to make the movie "the cove" and trained david blaine for his special "drowned alive." i experienced some of the intense mental and physical sport. taking the turn in the water in the cayman islands, trained to free diver. first the breath hold. all these lessons, the breathing, the mental call calisthenics calisthenics, geared to teaching me to ignore my body's cry for oxygen. see those convulsions? my body demanding to breathe. but that's the point he trains you to ignore. and after an hour of instruction -- >> up. breathe. breathe. breathe. breathe. breathe. breathe. >> good job, matt. >> whoo! >> that's a good, good solid time. i mean, for someone who's a free diver already. so that's a great time, an amazing time. >> reporter: and free divers are pushing the limits of their sport in many ways. krack runs an underwater obstacle course where free divers compete using water scoot tears. all in hopes of winning a thousand bucks and more importantly bragging rights. others like william winram and fred bule push the limits further by hold

i actually met david blaine up there, he did some magic tricks for us. >> what was he doing? >> he was hanging out. >> did he get a spa treatment? they have a really nice spa there. >> this was definitely post-work cocktail scene. >> gotcha. >> what else can we talk about? >> we can talk about what a lovely day it is. it's 7:45 in the morning. no. and you feel better because of that ice cold treatment you got yesterday? >> i have to tell you, i do feel a little better. i feel less foggy, if that's possible -- [laughter] i think the mind is like, you know, a little bit more sharper today. >> all right. go today. go every day. >> you know what? i think that we're going to find out, we're going to talk to the people, and there are people who go just about every day. >> we got into a chamber that was 140 degrees zero. it felt kind of good. >> you let me know whether he pleasure. >> it was border ryan agony at times. mike woods, what's happening? >> the cooler temps are back, the drier air, nice and comfortable on this thursday morning. poughkeepsie, 58, same thing in allentown, 6