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This may have been mentioned but as a cyclist, I am very in tune with vertical climb rates. Going straight up a hill is a lot harder than zig zagging back and forth across it, keeping your angle of inclination always less than straight up. Net energy used to get to the top of the hill is the same, but less force is required to keep your momentum. Use this technique on a 2 or more lane highway with no traffic, simply change lanes back and forth. As long as we're nitpicking....
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