It’s a snowy Saturday morning. A group of seven men sporting woolly caps and backpacks gather at the top of Parliament Hill on London’s Hampstead Heath.
Ranging in age from 44 to 57, they head off shortly after 9 a.m., jogging down the southern side of the hill.
This is no ordinary running group. In their professional lives they work for banks, hedge funds and private-equity firms. The 25-minute run is just a preamble. Soon they strip to swimming shorts, gloves and swimming caps, not wetsuits - and dive into a pond, which on this day is at barely 2 degrees Celsius, or 36 degrees Fahrenheit. It can dip well below that.
'That’s Cold in Anybody’s Language', the chalkboard temperature warning sign outside the lifeguard hut affirms.
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