Operation Ouch!

The doctors do the world's biggest poo in the lab to show you how your digestive system works, and we meet a horse-riding Brilliant Body.

Meet two new Ouchers, and find out how eye muscles work with an unusual fairground game.

The doctors make Billy Bones his very own bum and reveal the power of your gluteus maximus muscle!

The doctors super-size the heart to investigate the piece of body kit that makes it beat.

We learn about the structure of the nails and what happens if you stub your toe, don't eat enough veg, or get a fungal infection.

The doctors reveal the incredible energy stores that make your body work around the clock!

Dr. Xand swallows a camera pill to show the incredible villi inside his intestines which absorb the nutrients from food.

Let's find out how enzymes speed up chemical reactions inside our bodies! And Dr. Xand explores how music affects the brain.

Dr. Chris and Dr. Xand explore how body temperature works. And Dr. Dan and Dr. Raph bust some urban myths about how to stay healthy.

One of Britain's strongest women, Andrea Thompson, joins the doctors in the lab as they reveal how muscle fibres work.

We investigate how blood travels around the body and learn more about how being outdoors can improve your mental health.

The doctors explore blood types and reveal how your blood fights off unwanted invaders.

The doctors hit the road in the Ouch Taxi to surprise the winners of this year's Ouch! Awards.