Is it a myth or is it true?

I have had this discussion with one of my friends. He believe that people work out more when they live in warm weather climates than in cold weather. He's reasoning is because people that live in warm weather will work out more because they do not have to bundle up because the weather is better. I don't know if this is necessarily true but we as America's perceive that people that live in Florida, California, Texas and Arizona work out more. When you look at commercials or when ever they show these places on TV they always show how great people look and how great the place is. If you believe this to be true please leave a comment.