The name of the game is to know your limits. Not much you can do about the terrain, the heat, the humidity, the breeze ... or your age. But, pre-emptively lapsing into easy gears is one way to avoid heat stroke. Take it easy. And relish the way Oordeel Hill is actually a respite. 5.5 mph uphill is easy, when you have shade, and a compassionate, cooling headwind!
(It's a good idea to pack more than the minimum estimated amount of fluid!)
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