When I started to watch this video of Kelly McGarry going downhill through the hilly city of Taxco, Mexico, I thought: "This is going to be bad." So I measured my heartbeat and then resumed the playback. When it was finished, four minutes later, my heart accelerated from 89 to 95 beats-per-minute.

Maybe I'm too impressionable. Or have terrible health. Or this iPhone heartbeat app is crap. It doesn't matter. At every turn I thought of me going down the same route and smashing my head against a concrete wall or stairs step. Listening to his heavy breathing in my headphones didn't help to keep me calm


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