20/08/2026
UTMB is fast approaching – one of the biggest events on the ultra running calendar. Whether you're hoping to compete or complete a long distance event at altitude, here is how simulated altitude training gives trail and ultra runners a competitive edge:
More oxygen-carrying power: Training in lower-oxygen environments triggers your body to produce more EPO (erythropoietin), boosting red blood cell count so your muscles get more oxygen with every heartbeat.
Higher aerobic efficiency: Altitude work increases capillary density and mitochondrial efficiency, helping you maintain a faster pace at a lower heart rate.
Delayed fatigue on long climbs: By improving your body’s lactate threshold, simulated altitude keeps your legs feeling fresher during endless mountain ascents.
Faster recovery times: Enhanced oxygen delivery means quicker repair of micro-tears in muscle tissue, helping you bounce back faster between grueling long runs.
Mental toughness: Adapting to the discomfort of breathing hard with less oxygen trains the mental grit you need to push through ultra-distance dark zones.
The Cloud9 system allows altitude training up to 4000m, conveniently at home with a stationary bike, treadmill, stepping machine, rowing machine and even free weights. Our science-backed training protocols will help you reach your goals, whatever your fitness level.