is one of them. >> my name is tyler bradt.i'm a professional kayaker. >> he's traveled the globe traveling after rapid after churning rapid. >> what i've fallen in love with is the extreme side of kayaking. basically running difficult river, hard rapids, big drofrs and waterfalls. >> tyler paddled over his first waterfall at the age of 15, and has never looked back. >> i would say as an extreme kayaker i've probably run 100, 150-plus waterfalls. i've kind of lost count over the years. >> in september 2007, tyler came across alexandra falls in canada's northwest territories, far higher than any waterfall he had done before, 107 feet tall, and he decided to go for it. >> the feeling behind running that waterfall was a moment in time that i will remember forever. i surfaced upright without even flipping over off that waterfall. it was amazing. >> the ride over alexandra falls didn't just give him an adrenaline rush, but the world record for the highest waterfall anyone had kayaked over. tyler thought he'd reached the limit. nobod