A lot of these myths are things I encounter when talking about fitness with people, especially the cardio and scale points. While I have trouble adhering to some of these things (marathon training kind of flies in the face of limiting oneself to 20 minutes of cardio), I know the reasoning behind it.
How many of these facts are new to you? Would they change how you approach your own workouts?
Rapunzel's Adventures 
Great infographic!