Episode 4

It's the final challenge for Donovan Bailey, Gareth Thomas, Iwan Thomas and James Toseland.

In Japan they need to master the skill and precision required for the ancient art of horseback archery, known as Yabusame. Galloping down a straight track at high speed, gripping the horse with just their knees, they will be required to shoot at stationary targets and compete against each other.

Training starts in the UK with an archery and horse riding session. It's something none of them have done before and Gareth has to conquer his first phobia - his horse.

Finally the men learn the life of the samurai.

Being back in the saddle travelling at speed brings back old emotions for James and some aspects of the competition prove too much for Gareth and Donovan.

It's their final challenge. Who will be named the ultimate competitor?