Hypoxic stimulation has been a favourite training modality for athletes since the 1968 Mexico Olympics when it became clear how much physiological advantage could be had by training at high altitude. This is the principle behind the Australian-invented GO2Altitude system, which uses the latest Intermittent Hypoxic Treatment (IHT) technology and requires only about an hour a day of breathing while reading or watching TV. Used only by elite athletes and cosmonauts in the past, you can now buy or rent your own machines. The company web site at www.go2altitude.com is designed to explain the advantages of IHT as a drug free alternative for boosting athletic performance. It also lists the nearest gym or studio with available machine time.