San francisco's Fort Mason park is empty in the early morning darkness, every surface the color of a used cast-iron pan. It's pouring rain, and I've been wandering around since just after 6, trying to find ... well, I'm not exactly sure. All I know is that, according to a Face-book post, members of one of the strangest fitness groups in the country are supposed to be meeting here right about now. But the Google Maps screenshot I pulled from the website seems to have directed me to a parking lot. Or the front door of the high-end vegetarian restaurant Greens. It's hard to tell.
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