A dungeon where all of the creatures and traps try to grow and expand your muscles and height. At the cost of your intelligence and flexibility. Turning mages into dumb brutes. And fair maidens into tomboy amazonians. The people who grow too large turn into the dungeons minions too dumb to have any self agency as they walk around with their massive muscular bodies. The dungeon is filled with sweaty musk from them endlessly training. Both women and men get really muscular, the dungeon cares not.