I'm having trouble finding a suitable guitar-playing position, have opted for the weight on one leg/hip and head slightly back; and am very glad I don't have to do it for any length of time. But that's probably an age thing.
MsD wrote: Paul Simonon did that low-slung thing too.
I saw him play with The Good, The Bad & The Queen not so long ago and he mostly had it a bit higher up, presumably as a concession to age, with the odd lunge thrown in. On the whole he was in rather better nick than Hooky though.