The term freeskiing has been abandoned by the snow sports community that is being explained here It has since been split into two disciplines New school skiing and Backcountry skiing or Big Mountain Skiing The term freeskiing is now used exclusivley by the FIS to describe its aerials moguls and offpiste skiing The main difference is the rules The FIS has a governing body which limits the number of spins and flips in aerials and mogul comps while new school has no governing body or rules regarding what tricks cancannot be attempted