10 exercise myths

Every year, millions of people vow to be more physically active, but the vast majority of these resolutions fail. We all know what happens. After a week or two of sticking to a new exercise regime we gradually slip back into old habits and then feel bad about ourselves.

 So why is it so hard to keep it up?

 Daniel E Lieberman, Harvard professor of evolutionary biology, explodes the most common and unhelpful workout myths.