Rode 26 miles of trail (Pozo OHV area, Central Coast, CA) trying to keep up with a Husaberg 570FE and Suzuki 400, didn't keep up but made it! Nailed my shin on the peg when my foot slipped off on a big air, got a bruise the size of a lemon. It nailed me in the 2" gap between my knee pads and Garne boot top, such luck!
It was a real workout for this old man (61 year young) but I did it and if I keep doing it, maybe weekly, I'm gonna be in good shape in no time at all...if I don't kill myself trying!
My Gas Gas 280, Kim on his Husaberg
I don't know if you can see it, (iPhone photo) but at the horizon is the Sierra Nevada range covered with snow