Interview with Lena Headey in the Daily Mail. This just cracks me up:
I knew 300 was going to be a success and really enjoyed filming it, although having half-naked men on set certainly helped. They'd all been working out for six months prior to shooting and they looked amazing, strolling around in leather pants. But as the days wore on I started to think: "Oh, do put a jumper on, for goodness sake!" They would sit around flexing and comparing muscles saying: 'Oh, I must go and lift some weights', while I was virtually ignored.