Ever seen those three wheeled motorcycles, imagine lowering them to with 65mm of the ground, putting flat tyres on them, placing knee pads for the driver and hand holds for the passenger and then going as fast as you can, currently 200kph at Phillip Island.
It is so good I have been doing it for 40 years, it is the best thing you can do in leather and on your knees.
Beats absailing, sailing and maybe chicken on a highway.