Okay,
This is one of my favortie topics also,so forgive the preaching!
Before being a sparky, I was teaching Pilates, yoga and stretching for years.(still do teach a couple of days a week)
Got into sparkin' because I got bored being indoors and doing the same thing everyday...
Anyway, I learned a lot about how to properly use your body to do a task. When I started sparkin' it was in residential work. One of the worst things you can do for your body is to repeatedly work on your knees.
When trimming out plugs, I would sit on my butt to do the work; since I was an apprentice at the time, I caught hell from my JW who said, do it on one knee, your wasting time!
Trying to be as diplomatic as possible, I told him I worked with a lot of people with bad knees and this was a solution. He didn't like that at all!
My solution: I don't do residential work anymore. But I wish people had more of an open mind about doing the job rather than the job doing you! By the way, this guy had knee problems and his brother had a bad back.
There is a reason OSHA has guidelines for safe work pratices.
I'm 46 now and still in good health. I hope to be sparkin' well into my 70's!
Spark in good health!
-Brian