HYPOXcontrol S is an efficient and versatile altitude training system. Training at simulated altitudes is recommended for any athlete who wants to optimise his or her performance and endurance levels. The HYPOXcontrol S portable training system gives patients air with reduced oxygen levels – hypO2xic – to breathe during the first interval and provides them with oxygen-enriched air – hyperO2xic – in the second interval. With this interval altitude training system, the body‘s own altitude acclimatisation effects can be utilised for increasing performance levels during competition phases in a targeted way. The regeneration and rehabilitation phases are also optimised.