Please tell us more!
Oh, sure. It's similar to the "danger room" discussed in a few other threads (and I think described in the wiki). Except instead of wooden spears, I use steel spears. I have all my "real" military squads train at the barracks with the wooden spear danger room.
But I also have one squad of expendable dwarves, training at a different barracks which is out of the way of the rest of the fort. That squad's uniform is set to NOTHING. That barracks is surrounded by upright steel spears all attached to the same lever. One pull usually results in a few dwarves wounded enough to need to rest and get diagnosed and treated. I never have the lever set to repeat because that would lead to dead dwarves and therefore the healthcare workers won't work on them. Also, useful dwarves going in to recover the wounded might get hurt.
Anyway, a few wounded dwarves end up getting diagnosed which keeps the diagnosticians from getting rusty. The treatments keep the other healthcare dwarves from getting rusty. If a dwarf ends up with "ability to stand lost", I lock the room until he/she dies. Otherwise, I just allow the healthcare process proceed on its own. Once all the hospital beds are empty, repeat the process. Every now and then a dwarf ends up dying, but there is always another expendable dwarf available to take his/her place.