hanger offerer er er. like bazz i only move my bum half off the seat, and it's for a couple of reasons, i'm only short so there's no way i'm getting my knee down on public roads but dropping the shoulder and getting my knee forward (rather than sticking out like a wayward boom) weights the front of the bike, also keeps it a little more upright so you can go faster. hanging off also helps with change of direction too, cause moving your bum from side to side encourages extra leverage on the bars making direction changes quicker. this is only when i'm in the mood to go fast, if the wife is on the back or i'm just plodding along i keep my bum planted on the seat.
paul.
p.s fast is a relative thing, my fast may be embarassingly slow, probably is actually.............