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As the 25,000km race to Ushuaia approaches the halfway mark, the four teams compete not just with each other but with the extreme altitudes of Peru.Ìý
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At the checkpoint in the Tatacoa Desert, leaders Emon and Jamiul are first to learn that the fourth checkpoint is Puno, a city in southern Peru sitting 3,827m up on the edge of the highest and largest lake in South America, Lake Titicaca.
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The first hurdle is leaving the Colombian Desert and bypassing the ongoing state of emergency in Ecuador. With vast swathes of Amazon jungle making a detour around Ecuador impossible, drastic measures have to be taken to ensure the teams’ safety.
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Jen and husband Rob are growing in confidence. Working at a rescue sanctuary for the only species of bear native to South America - the spectacled bear - makes the couple reflect on their plans for the future.

Dom and Lizzie discover a connection to their grandmother in Peru’s capital, Lima, bringing them closer together and giving them an emotional boost in the race.Ìý

Jo and Sam share an adrenaline-fuelled adventure in the stunning sand dunes of the Atacama Desert.

But no-one escapes the effects of the altitude, making the sprint to the checkpoint Puno a dramatic and punishing foot race.