Feels good to be on top but if you're on the bottom, bring

[theking]

...lots of water:

3 hikers dead in Grand Canyon National Park; extreme heat blamed
Hikers were on trails in the Inner Canyon, where officials said temperatures in the shade could reach 109 degrees around midday.
Three hikers died from suspected heat-related illness in Grand Canyon National Park amid extremely hot temperatures, officials said. Grand Canyon National Park rangers and emergency personnel responded to incidents on June 12 and June 16, resulting in three deaths, according to a June 19 National Park Service news release. Hikers were on trails in the Inner Canyon, where officials said temperatures in the shade could reach 109 degrees around midday.

Took these photos when I was there: