I presume you mean off road - I'm no expert,it's 10 yrs since I last rode fast off road,and I don't think I'll be doing those speeds ever again.I prefer to stand up,but I see the trend these days is to sit down most of the time,I would only sit down for a tight turn.Elbows out,and move well forward in the turns,inside foot up by the axle...this keeps weight on the front as you slide the rear around,if you don't move forward you'll push the front right out from under,or you'll wheelstand uncontrolably coming out of the turn.Stand on the pegs and let the bike float under you,no weight on the bars,move your body forward or back to shift weight.
Pick your lines well in advance,don't sit at the bottom of a hill looking up - get it sorted before you get there and hit it hard,picking as straight a line as possible,the momenteum will take you halfway up before you have to start working hard for traction.Mud and sand,lean well back and use lots of throttle,pull as tall gear as you can,rocks pull a gear down and keep the revs up,you can snag a stall at lower engine speeds if you get into trouble.
Just keep at it,a step at a time,learn from your mistakes - falling off is one of the things you laugh about off road,it's a good thing....not a serious issue like on the road.
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