On a sidenote, this is one of the most fun things you can do and is almost another style of riding all together (all-mountain freestyle?). So definitely do as Wolf suggests here and give it a shot. Everything from transitions between cat tracks, side hips, natural moguls or stashes and if your balls and the mountains you ride are epically big enough, dropping over big cornices into steep grades.Another concept that is invaluable is the "outside in" method. Quite simply it is learning much of your freestyle moves outside of the park, using natural features as you are free riding. This allows you to dial in your freestyle riding without the pressure and potential hazards of of being in the actual terrain park.