> A couple more questions, then:
>
> 1. How about
> (i) a press-up in a headstand position
Oh, oh, one I can/could do! Use to be able to do this when I was in school, push ups from headstand to handstand and back again. Can't do them now, mainly 'cos I've lost all sense of balance.
> (ii) a push-up with someone sitting on your shoulders
Yay, I like these
Managed to do one of these with my dad (15st) sat on my shoulders. It nearly killed me, don't accept dares from family members!
> (iii) a one-armed pull-up while holding another climber under one arm (the other one, presumably. A feat attributed by Abrahams to Owen Glynne Jones, which I would have confidently said was impossible, but please confirm)?
I've pulled a belayer off the floor trying to get slack in a hurry (one hand on hold, one hand on rope, haul very hard), does that count?
> 2. I am confident that I couldn’t do any of these if I trained specifically for a thousand years. What proportion of individuals do you think have the genetics to do, say, a one-armer if properly trained?
I'm not sure I believe that. I've never done any specific weight training or gym work but I notice that if I spend more than an evening a week climbing I get stronger, if I spend less than that, I get weaker.
So I'm sure if sufficient dedication was applied by pretty much anyone, they could do at least some of these. Decent training schedule and diet would probably speed up any strength gains, but "just doing more exercise" should work eventually. For the last two, careful choice of "someone" will make things easier, for the first, it's mainly a matter of balance.
Admittedly for me (iii) did depend on a fairly large amount of adrenaline being present, (ii) was in the presence of suitable alochol and peer pressure and (i) was one of those things you learn how to do during school gym classes.
I've no chance of doing any of the finger stuff in the near future, and I've never been able to. I have caused permanent damage to two of my fingers through trying to haul on them rather than falling off (yup, both ring fingers) so I don't really want to try these games too much, especially as they don't seem to affect climbing ability too much. Finger strength really seems to be required for very specific problems, generally better footwork and technique seems to be the key to climbing harder (that, and a relaxed attitude to falling off).