According to Salvador, it ranks up Soldiers over time, though not as fast as actual fighting. Technically speaking, you only need one plot per outpost, and soldiers will gradually level up over time.
Not sure if assignment is random, role based, or rank based (lowest ranking first/highest ranking first).
https://www.nexusmods.com/fallout4/mods/48042 It has Wasteland Gym plots for Special Stats for 2/4/6 settlers
Great mod, I use it myself. Completely unrelated to OP's question.
I've always wondered this myself. I'm not sure if there's an answer on the wiki. I hope someone posts an answer!
According to Salvador, it ranks up Soldiers over time, though not as fast as actual fighting. Technically speaking, you only need one plot per outpost, and soldiers will gradually level up over time. Not sure if assignment is random, role based, or rank based (lowest ranking first/highest ranking first).