The race is on and the teams need to decide on paddling or sailing.

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For over a week, 66 teams of endurance athletes have suffered through the grueling conditions of the World's Toughest Race. They have pushed themselves to their physical and emotional limits in their quest to finish the 671 kilometer course. For 29 teams there are still 3 more days of racing to go before the final cutoff. In the predawn mist, Fijian Team Tabu Soro emerges from the icy waters above Vuwa Falls, but one team member has suffered a fall that puts the entire team's race in doubt. Farther ahead, Team Curl struggles with equipment issues during the mountain biking, but one racer shares his personal motivation to push on. As Team Costa Rica finishes the mountain biking, they must rally around one teammate who breaks down from the suffering. Facing a difficult navigation, a group of teams decide to band together on Leg 4 to ensure they stay ahead of race cutoffs. On Day 10, a hidden injury of a member of Team Flying J worsens, and his team captain is forced to make a ...