Dark, mysterious atmosphere, grandiose chandeliers, ornate stone walls, stained glass windows, vaulted ceilings, heavy wooden beams, luxurious velvet drapes, intricate ironwork, mystical symbols, eerie candlelight, fog machines, dramatic spotlights, avant-garde equipment designs, bold red accents, medieval-inspired architectural details, lavish tufted upholstery, rich brocade fabrics, ominous soundscapes, intense workout areas, state-of-the-art machinery, motivational quotes on ancient stone plaques.