The Cold Half Extreme Marathon Swim runs along Hong Kong’s most stunning views. The race is open to solo swimmers, or relays of two people. Like the “Clean Half” race every October, the race is both a celebration of the amazing water and geographic assets we have in Hong Kong, combined with extreme sports, and an appreciation of the environment. This is the only cold water race in the region where swimmers can train for long swims like the English Channel, with the cold water to go with it.