Extremes

We only get one body, and that one is pretty fragile. It doesn't stop some people from pushing it, though:

Tom Clarke discusses whether the human race is getting weaker

Is this it?

Is modern medicine making us weaker as a species? Find out why our culture may be hindering human evolution.

Dr Graham Easton discusses his views on the natural human lifespan

Who wants to live forever?

What determines our natural lifespan, and is it possible to slow the aging process?

Fear

Mike climbs a crane to combat his fear of heights, and Zeron sleeps with Boa Constrictors to overcome his extreme snake phobia. Confronting fear is the name of the game in scaredy rats.

Sleep

Mike Leahy battles to stay awake for over 60 hours to determine the effects of extreme deprivation on the body in 'Up All Night'.

G-force

Mike and Zeron compete for the chance to ride in an F-16 fighter plane in 'Fit to Fly'.

Sperm

Mike and Zeron find out how to keep their sperm in tip-top shape, make plaster casts of their testicles and take part in the world's first on-screen sperm race in able-bodied semen.

On the spot

Footballers can be made famous by a memorable goal. Yet what lies behind those perfect penalties?

A contestant in The World's Strongest Man

Charge yourself up

Faster, faster! Kris Akabusi gets his heart pumping as he finds out the secrets to physical power.

Taking a chance

Kris Akabusi investigates the need for speed and asks why some people are attracted to the allure of danger.

Breathing lessons

Jonathan explains to Kate why breathing underwater gets trickier the deeper you go in the beneath the waves video extra.

Bungee jump or suicide leap?

Could Bruce Willis have saved the world with a singlet and a hosepipe - or would he just have created a nasty way to Die Hard?

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