Welcome to Muscle Girls City, a one-of-a-kind fictional metropolis where every resident is female, and every woman and girl takes pride in becoming as strong as she can be. Towering skyscrapers share the skyline with world-class gyms, Olympic lifting halls, wrestling arenas, climbing centers, and outdoor fitness parks. Strength is simply part of everyday life.

Visitors often hear an old urban legend claiming that something was added to the city's water supply decades ago.