They look indestructible, superhuman - the physical embodiment of female strength and empowerment. Since the 1970s, women bodybuilders have invaded gyms and competitions across the USA - making a major impact on a sport once strictly dominated by men. But the invincible facades these champions present to fans and worshippers don't tell the whole story. We investigate what attracts women to the sport, both personally and professionally, and what they sacrifice to achieve their freak physiques.