ThumperX wrote:That down hill jump looks fun! Great riding guys!
I was gonna say the same thing but he beat me to it.
It also looks like it could really mess up your day if you hit it short... a downhill-facing over-the-bar launch would definitely ruin my day. You hit it pretty good each time!
On the standing/sitting thing:
When riding standing-up, half of your body mass is now even higher above the bars than it was when you were sitting. So the center of gravity is now taller (like stacking 5 pallettes of bricks ontop of each other in the center of a flatbed truck, vs. stacking only one). The benefit to standing is that it takes the seat out of the mix, and allows you to move the bike beneath you as you maintain control. (instead of being at the mercy of whatever the seat is doing if you ride sitting down all the time).
I have been told I sit down waaaay too much when I ride, and am working to correct that. One guy told met to keep in mind: sit down when you need to turn or seat-bounce, and other than that, ride in the standing/attack position. (What that looks like kind of reminds me of what you might look like if you snuck up behind someone and were getting ready to scare them -- knees bent, back slightly bent, arms up, butt sticking back, using rowing motions to smooth out track bumps). When you need to sit for a corner, you go from that attack riding position and step right down
into your turn, in 1 motion: sitting up front on the seat, leg out, elbows up, butt crack on the outside of the seat).
If you have a workstand, put the bike on it and try it. It feels really strange at first.
It's getting that 1-motion transition between the standing and sitting that's the hard part. At first it will feel like you're actually stepping off the bike while it's in motion.

So go slow when you try it. When you get comfortable with it, cornering is pretty fun, and it's flat out awesome on a groomed/watered track. The motion is a little harder on a dry track I think, because you have a natural tendency to want to sit early and get the leg out to save the front-end if the dry dirt slips out from under the front.
Great riding. Sweet track too.