Michael Mosley goes to physical and mental extremes in this entertaining documentary which unravels the biological, sensory and evolutionary mysteries of pleasure and pain.

On a journey to discover the truth about exercise, Michael Mosley reveals new and surprising truths about what it does to our bodies, and why we all respond differently to a workout.

Uncover the secret life of your digestive tract in this eye-opening and detailed exploration of a part of the body we normally never get to see. Enter the strange and mysterious world of the human stomach!