Half-naked participants take part in the second “Guangzhu (naked) Run” in their underwear on a winter morning at Olympic Forest Park in Beijing yesterday. About 100 people joined the event, which required them to run wearing only their underwear for 3.5 km, as a way to promote environmentally friendly lifestyles. The lowest temperature in Beijing yesterday was -1 degrees Celsius (30 degrees Fahrenheit). SD-Agencies)