Look, if necessary I'll come to London and guilt-trip you into doing it by going "oh, but you have the physical capacity to do it, I wish I could go out in a boat..." and look pathetic at you. Seriously, you shouldn't ever ever look at something perfectly possible that you'd like to do and then not do it, cos trust me, if you end up in a position where you *can't* do it, it will drive you f**king NUTS.