is one of them. >> my name is tyler bradt.la, montana, and i'm a professional kayaker. >> this 23-year-old has been kayaking all his life and travels the globe tackling white water rapid after churning rapid. >> what i've fallen in love with is the extreme side of kayaking. big drops and waterfalls. >> tyler paddled over his first waterfall at the age of 15, and has never looked back. >> i would say in my lifetime 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 th