"A cyclist can go 3 or 4x faster than a pedestrian, but uses 5x less energy. The Bicycle is a perfect transducer that matches metabolic energy to the impedance of locomotion. Equipped with a (good) bi...View More"A cyclist can go 3 or 4x faster than a pedestrian, but uses 5x less energy. The Bicycle is a perfect transducer that matches metabolic energy to the impedance of locomotion. Equipped with a (good) bicycle man can outpace the efficiency of not only all machines, but all other animals as well." #LoveBicycling