What I think could be a great tool for teaching young guys is the "old" guys. Let a couple of the older guys speak to the young guys. We all thought we were superman when younger, and that we would never end up like some of the older guys who hobble around or just cannot really do what they could when younger. See if you can get pictures of some of the older guys from their prime. This way the young guys may be able to relate better.
I would volunteer to be the first. I was a good athlete, very strong and could bend like a pretzel.
Then I started work, I sat on cold concrete, picked up things that now make me wince just thinking about it, cut myself so many times, that I could give blood to a 3rd world country. Now I do not bend so well, I cannot carry anything like I used to and the strength in my hands, arms shoulders, back and legs are pretty sad to say. My right knee suddenly just gives out whenever I least expect it to. That can sometimes be embarassing. This experience has led me to say if I had to do it all over again knowing what I know now, I would do it differently.