Sport climbing makes its Olympic debut at Tokyo 2020. But there's a catch: competitive climbers usually specialize in one or two of the three disciplines: lead, bouldering or speed. But at the Olympics, there's only a combined event, meaning athletes like Canadians Sean McColl and Alannah Yip have spent the last couple years becoming elite generalists for a shot at an Olympic medal. Come behind the scenes with Andi Petrillo at Yip's practice and McColl's climbing cave he built in his house, and learn all you need to know to watch climbing at Tokyo 2020. Subscribe to CBC Sports: bit.ly/CBCSportsSub CONNECT WITH CBC SPORTS ON SOCIAL Facebook: facebook.com/CBCSports Instagram: instagram.com/cbc.sports Twitter: twitter.com/cbcsports Read CBC Sports Online: bit.ly/CBCSportsWebsite