

if training space becomes available because someone has reached max endurance, check xp on all "stored" dwellers and let the one with highest exp train first. but it also depends on how long you take for training. If a fight happens, i just send my combat-squad in and normally the xp from the rare fights that come into those specific rooms is not enough to get anyone to level 2. there they are doing absolutely nothing but at least also not getting exp.

if radio room is also full, i put them in storage room. that way they are doing at least a little bit while they are waiting for training but still not getting any xp. if there already are 6 people in endurance training room, i use the radio room as storage. i train everyone in endurance first and all other stats come only when endurance is on 10. Oh, ok, then only possible way is to not get xp and be careful to not use people for any fight or any production if you want them to stay on level 1.
