The first irritating comment you get when you mention that you're running a marathon is: "It's not good for your knees..." But to those smug armchair naysayers, there's new evidence: actually, it is. Particularly for midlifers.
A new myth-busting study of novice middle-aged runners by researchers at University College London and Barts Heart Centre found that training for and running a marathon not only wasn't bad for their knees – it actually improved them.
