Ups and Downs
Cycling approximately seventy-five miles every day is demanding but throw in a 2,000ft climb in red hot desert heat and you've got a real challenge on your hands.

Place yourselves in Mark's shoes (or saddle!) this weekend as he prepares for another ever-familiar ascent. It's expected he will reach a huge 8,500ft - almost twice the height of Britain's highest peak, Ben Nevis - in the next few days. It's a gradual climb that started at around 5,500ft in Chinle, Arizona and will dip back to around 4,500ft as he continues into New Mexico.
This is the highest Mark has been since he reached the summit of Denali at the beginning of the journey. The sharp climbs keep coming thick and fast as Mark aligns himself to the route of the American Cordillera, and will continue as he heads further south.
More details to follow on Mark's progress during the weekend, but for now here is an altitude profile of this section of the route to keep you entertained.

Altitude profile courtesy of topocoding.com
Find out more about the baking Arizona heat with BBC weather.
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