When you pass a mirror, do you automatically suck in your tummy? Are you doing any extra fitness to get your stomach ready for the beach? Never mind the look on the outside, how much attention do you pay to the inside - to your GUT? This week Gillian Russell and the team are aiming for a "personal best" in gut health...! Doctor, blogger, personal trainer and author of "The Food Medic For Life" Hazel Wallace explains what happens in our guts, why the bacteria inside us matter and the role stress and relaxation play in our gut health. Richard Forbes meets Katrina Mather, founder of The Body Toolkit, to find out about the gut retreats she runs for those in need of a reboot ... while Grace describes the benefits she (and her gut!) felt from trying out their juicing fasts and changing her diet. Dr Wendy Russell from the Rowett Institute Of Nutrition & Health talks about what foods we should be eating to improve our gut health, whether detoxing and juicing work and the connection between our gut and our brain.