In the fourth season of Ultimate Rush, the quest to achieve unimaginable feats takes viewers on epic adventures – from soloing the treacherous peak of Cerro Torre, to flying through the narrowest crack between rock-cliffs in a wing-suit, to leaping from a 200-foot waterfall. Sporting legends such as Danny MacAskill, Mark Visser and Xavier de Le Rue travel across the globe to find the remotest and most spectacular destinations. Here they push the limits of their sport. The cinematic journey leaps from Argentina to Tanzania, to the Pyrenees, and beyond. One question remains: why risk it all? The new series reveals what motivates these groundbreaking athletes as they chase their dreams.