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Technical. Rugged. O2X is 838m (2,750 ft) of elevation gain over 8 km. Registration is open for O2X Summit Challenge - a primal trail race for runners tackling a professionally designed course. Starting at the base of Grouse Mountain, racers trek across multi-pitch rock scrambles, rivers, steep glades, streams and other naturally occurring challenges before reaching the peak. This is NOT the Grouse Grind and this is not an entry-level race. Expect pounding lungs, screaming legs and pure elation as you reach the summit.