If you put a guy in bronze armor up against opposing ramp-bouncing featherwood minecart, he'll very quickly (much faster than wooden spears) gain dodger, armor user (initially bit more than half as fast, but as dodger improves drops off), brown wounds, then yellow wounds (featherwood minecart is heavy enough to bruise through bronze armor), then starts to have the wounds heal..... (I picked someone who was very flimsy, quite suspectible to disease and very slow to heal).
Clothed dwarves will quickly get yellow and red wounds, of course. Still, almost 1 armor user and 5 dodger in under an in-game week. (Maybe 2 opposing minimum-speed rollers would be less deadly enough? The cart does go up to 35k on the ramp, iirc)
Also, apparently, dwarves can maintain "sleep" job while dodging a minecart, though they don't actually get the Z status that indicates sleep.
Still, an interesting 10 minutes, though the setup to avoid braining children,babies and miners while braining everyone armored else may be somewhat micromanagey. And for shield training, spears are still necessary I guess (Dude did have shield in inventory when I stationed him, but no exp.)
Edit: Apparently the world gen was long enough that the armored test subject is also legendary in 9 different kinds of music, poetry and dance.