How Chuen Monkey Kung Fu by shifu Douwe Geluk. Douwe Geluk learned the How Chuen Monkey art from his master Fred Decramer. This monkey system is based on the straight up walking monkey the bigfoot, sasquatch, yeti in Chinese it is called Yiren. Douwe Geluk created this How Chuen video course so that more people can learn this rare art of the Sasquatch.