Nice initiative creating this topic, physical conditioning is as relevant as product or pad choice.
I was impressed at once when I saw Mike Phillips thread regarding Rupes 21 vs 15, and what called more (mine) attention was the actual workout that man was doing than the polishing work per se.
Trust me, I felt more tired than him just by watching the video!
I had always been a workout guy, going to gym almost 15 years now, 3x week at least, regularly. Apart from that, as a good brazilian guy, SOCCER play a huge role in our condition, at least 1x week... Had took brazilian jiu-jitsu classes and capoeira, swim, etc, love that all...
However, nowadays, my heating up is the washing procedure, and the actual workout is the polishing session.
What I keep in mind while detailing is to use it in my favor, not against me. By that, I mean one must focus on proper posture and breath, just like while doing any other physical activity. If people don't mind for the right posture / breathing while working hard, they are probably working against themselves, and in no time they will suffer the consequences from that.
Maybe someday we'll even be introduced to Detailing Pilates (LOL)...
I like to use Pilates principles to maintain proper posture / breathing while working. It's easy for anyone to do a brief search and understand what are the principles of that (strengthening the core of the body + proper breath).
The rest is 'history', and the huge marketing world we face, if with a ball, Pilates on the Ball, if in the water, Pilates in the Water, if with a Porter Cable, Pilates with the Porter Cable!, and so on!
Joking apart, keep informed about the essence of the Pilates Method and try to use it as you stand working on detailing.
For sure, if you feel uncomfortable (or believe it's too hard to assimilate), there are lots of professionals ready to teach you the proper technique. Guarantee you'll benefit on the long run preserving your posture and breathing properly.
Kind Regards!