as a kid we used to sneak onto the BMX track down at Eastway which you would know as the place they built the Olympic stadium on, BMX was always about racing originally and the freestyle came along after.
I remember trying to do various tricks as a kid, even now it's hard to resist a bunny hope be it on my commuter or my MTB, even the other week me and friends were in the forest on the fireroad moving trails and standing up no hands honestly best fun ever ;-)