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I've signed up to run the Grand Canyon in early September with my 60 year old Aunt... She's very fit and has done this run/ hike (as she refers to it) several times before. But this time, she wants to do rim-to-rim in 17hrs, starting early one morning (when temperatures will be freezing), running throughout the day (when it will be very hot) and then finishing late evening (getting cooler again).
As a central-London based ex-middle distance club runner, it's obviously very hard for me to find similar conditions to train in! I am in good shape in regards to cardiovascular work, I've got a strong core (from Bikram yoga; I hope you've been reading my blogs on this very site!), and whilst I am quite heat-tolerant, I am a bit worried I'm going to suffer heat exhaustion at some point.
Has anyone done this hike/ run or similar? What kit should I bring? Any advice on shoes? I would like to pack as lightly as possible. Any advice of any kind would be greatly appreciated.