Trainer Luke Richesson quoted in Men's Health magazine: "Your body adapts to the posture you most often assume. If you sit at a desk all day with your shoulders slumped and your neck protruding forward, then you'll inevitably have a posture that looks more like Neanderthal man than Superman. Want to be the best you can be...? Think about posture every waking minute.

Your mother was right, don't slouch.