Translation / up-to-date usefulness
(see Instapost #pktheory29)

If usefulness is measured by the goal of collective well-being, physical strenght and nimbleness might be the least useful of all. The old Pk motto is a bit outdated. Besides being a fun activity and a job maybe (which is already something), Pk doesn´t seem to be of much more benefit at first glance. Though i can see something useful in it.
Each craft can teach principles, that, if translated, can become very useful beyond the boundaries of that craft. Maths, as an example, consists of purely abstract principles, though its application in other areas of life has very concrete results, such as the phone on which i´m writing this (no maths, no informatics, no internet, no apps, no nothing).
I think also Pk involves many abstract principles that can be translated to other areas of life. Now jumping on concrete walls is very concrete (compared to maths) and underlying principles are not that obvious. So, in order to find some principles you need to abstract Pk first, so that the principles behind it become visible – then you can see if there are some rules that can be translated to other areas of life.
Here is an example: If you look at smooth movement and try to find out what makes this smooth movement smooth, you will quickly find that one factor is this: the working together of single components as one, towards a common goal. Seeing this will make you understand why mankind is not really „moving smoothly“ (see also "principle of oneness"). It might also lead to your conclusion that it makes sense to pay your metro ticket in order to make the living together in a society smoother. There are endless examples of these translations, if you look for it.
Seeing Pk this way it has become more than jumping - it has become a language through which you can learn stuff. I have no doubt that the same counts for lets say carpenting. Or golfing, etc.