Regardless of what condition you find yourself in, you just have to get on with it. You might be shooting a Spring line in the middle of Winter and you're not even the one who is wearing a bikini in the snow. It doesn't matter if you're too hot, too cold, too tired or too hungry, you'll strive for perfection and you'll be completely on the ball from the start of the day until it's a wrap. You also need to prepare yourself for the fact that 'anything could happen', even if you don't believe it.