"...When downhilling, you want to be as far back as possible so that you're not fired over the bars..."
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This is a concept I understood back in the days when I had a BMX (it was a Supercross, quite a nice bike in those days). Unfortunately for me I didn't check the nut and bolt that tightens the handlebars and while I was coming down a fairly steep hill the handlebar collapsed forwards and my face was pressed into the front wheel before the whole lot did a cartwheel. There was a moderate amount of blood but a whole shedload of cursing.