Sabrina Frederick

Recruits must race up a snow-covered mountain dragging a 60kg sled; a swim under ice in hypothermic conditions will see the weakest of them sent home.

The recruits face some intense interrogation before attempting the final phase of the course, a brutal gauntlet of physical tasks known as The Sickener.

Celebrities undertake a series of extreme tasks, including jumping backward out of a helicopter and hand-to-hand combat, as they begin the challenge of completing the gruelling SAS selection course.

Recruits confront their fears head on with a 60m high forward abseil; a rough game of murderball on a black mud plain leaves a recruit with a near concussion.

The recruits must crawl across a jagged ravine on one rope above the ocean; the contestants get submerged in cold surf; the recruits experience a physical drilling that puts them on the brink of physical collapse.

The recruits are armed with rifles to take on a hostage rescue mission, before embarking on a perilous task in near-freezing water.