[Cycling up the steepest hills of San Francisco][1] looks like quite a challenge, especially when you see the struggle at the end of the video.
[1]: http://ia310126.us.archive.org/2/items/FrankChanRussianHillRoulette/bikescape_6906.mp4 (Russian Hill Roulette (direct link to MP4 video) [site language: English])
