I completed Challenge 4 on 22 June 2015 with Rob Wilkes. We waited until 7pm to climb the legendary Alpe D'Heuz climb, with its 21 switchbacks and 10%+ gradient. The weather was a balmy 28C and clear, which made for a warm ascent and a reasonable amount of pain.

I have no idea how the professionals manage to climb it in almost half the time we did!

Challenge 4 - Alpe D'Huez