Couldn't resist taking the chance whilst on holidays with the kids last week to have a quick crack at some loose berms on a nearby (very degraded) BMX track, which has been cut to pieces over the years by pitbikes, motocross bikes. Track was on a sand base, with lots of loose cover and some berms.
It was interesting seeing how much fun was involved in building up speed to drift into the berm, and the minimal wheelspin created by the motor in those riding conditions - quite different to what I'm used to with enduro bikes. Still achieved an easy maximum heart-rate workout and had quite a sweat up. But that might have been the pneuomnia I was coming down with..