Ultrarunner Karl Meltzer has long dreamed of setting the speed record for crossing America's Appalachian Trail. Now he sets out for his third and final attempt to run the 3,523km (2,188 miles) in less than 46 days, 8 hours, 6 min.

The mysteries surrounding her father's death in the Vietnam war lead ultra-endurance mountain biker Rebecca Rusch on an emotional journey as she pedals 1200 miles of the Ho Chi Minh trail.

Iconic snowboarder Travis Rice and friends redefine what is possible in the mountains. Experience the highs, as new tricks are landed and new zones opened, alongside the lows, where avalanches, accidents, and wrong-turns strike.