At the age of 15 , he gave up competitive horse riding to focus on skiing .
At the age of 15 , he began the transition from alpine to freestyle ; at one point he won a downhill race and a moguls contest during the same weekend .
At the age of 15 , he gave up competitive horse riding to focus on skiing , and began the transition from alpine to freestyle ; at one point he won a downhill race and a moguls contest during the same weekend .