Surprisingly little info. out there re: this topic, perhaps someone will prove me wrong? Quite likely, actually.
Here's some from Summer Gravity Camps in Whistler, they want your $ though, so...
What's your ability level?
At SGC we work with all levels of riders. If you can ride a mountain bike, we want you here!
Have mountain biked off road on flat terrain. Can ride single track, but has had very little downhill riding experience. No jumping experience at all.
Confident on most single track. Have ridden downhill a little bit. Still cautious with speed and the more challenging steeper terrain. Have very little jumping experience.
Is confident riding on technical terrain with rocks, roots, logs, drops in most conditions. Have spent some time in the air jumping. Ready to turn it up a notch and learn how to go faster, ride steep terrain, take bigger air, and learn some cool tricks.
Rides very aggressively and is comfortable biking over anything; logs, rocks, roots, steps, and drops at most speeds. Very physically fit. Likes to take air and do tricks. Looking to refine your riding and learn more tricks from the masters.