In reply to shark:
Simon, again many thanks. Where I train, there are few warm-ups, and it's easy to get bored with them. So I've been experimenting with hanging off various combinations of holds with poor feet, in trainers. And this seems to work pretty well. Outside, on Portland, it's harder to do this but, certainly on my current project, having a warm-up which will give adequate recruitment is vital. And I think I've found one. For me now, the quality of the warm-up is fundamental to success.
I remember Pete Oxley saying that, when he was younger, he could do a big drive, get out of the car, climb E7 straight off, if need be, and get back in the car again. No warm-up needed!
Re the hand dunking, as a sprog, I used to hold snowballs until they melted (Hermann Buhl fashion). The pain was excruciating. Not sure it did much good apart from a bit of character building.
Mick