Inside the Human Body

00:00:02 This athlete is a champion

00:03:06 And while you're sitting there, the 250 square metres of your gut

00:05:03 "Are you sure?" Yeah.

00:07:35 And it clearly works

00:09:38 It's quite remarkable when you think about it

00:12:48 But by ten weeks, you had developed your face.

00:14:57 If it doesn't happen then, it never will.

00:17:05 Today is the first step towards a new life.

00:19:29 And to do this, the hole in his heart has to close.

00:21:56 This man can hold his breath for a whopping nine minutes.

00:24:11 for an incredible nine minutes.

00:27:02 Jog, jog, jog and now...108. Right, I'm going see how far I can push it

00:29:15 Here, light from outside shines down

00:31:46 You can actually watch this happen with the help of an infrared camera.

00:33:51 because you are using something like 54 different muscles in your leg

00:36:34 In a form of bullfighting, known as recortes

00:39:38 You also have the largest organ in your body to fall back on.

00:41:44 The water here is just above freezing

00:43:49 in fact, why we dominate the planet

00:46:48 if only they could get in.

00:49:19 you also spray a fine mist of droplets

00:51:26 What letter's that one?

00:53:57 destroying the viruses inside.

00:56:24 We have the same hearts...