Beijing's winter is cold in the eye-watering, cheek-tightening, nose-running sense of the word. Yet, every year dozens of senior residents brave the big freeze to strip off and swim in the icy waters of the city's lakes and outdoor pools. Here, a group of winter swimming enthusiasts, most of whom are elderly, stand at the half-frozen Houhai Lake with a temperature of around minus 2 degrees Celsius, Jan 12. [Photo/IC]