Rugged reality television, programmes on a theme of masculine resilience and determination, have been specially packaged for screening on Father's Day, Sunday, on DStv's BBC Knowledge.
Programmes featured throughout the day will include SAS: ARE YOU TOUGH ENOUGH?, from 7am to 9pm, which highlights Britain's Special Air Service's recruitment and training regime, which has been designed to break people.
Legendary for its relentless rigour, it is the ultimate physical and mental challenge for all who are privileged enough to take part.
In this hard-hitting elimination show, hosted by Dermot O'Leary, 29 UK civilians are pushed to the brink as they are challenged to prove they are tough enough to survive the gruelling SAS initiation process.
The Trossachs in central Scotland provide the treacherous terrain for the exercises and after each challenge, contestants are weeded out until only the bravest and toughest are left.
Also lined up on Sunday, from 9am to 3pm, is SAS DESERT: ARE YOU TOUGH ENOUGH?, in which 24 members of the public go back to the roots of the SAS, taking on Special Forces training in a desert environment similar to that of World War 2.
Host O'Leary commentates on the new recruits' progress, as Staff Sergeant Eddie Stone puts them through their paces.
The unforgiving terrain of Namibia's Skeleton Coast is the setting for the challenge, as the recruits learn to live, travel and fight like the military elite.
Harsh conditions and a punishing fitness regime await them as they attempt to prove they possess the mental and physical prowess needed for the SAS.
Another programme of note on Sunday is HUNTING CHRIS RYAN, on BBC Knowledge from 3pm to 6pm.
When the Bravo Two Zero patrol went horribly wrong during the Gulf War, SAS trooper Chris Ryan was the only one to evade death or capture. His incredible escape marks him out as one of the toughest men in the world.
Now Ryan's mental and physical strength is put to the test against an international team of former Special Forces soldiers, who try to hunt him down in some of Earth's the most extreme environments.
SAS JUNGLE: ARE YOU TOUGH ENOUGH?, scheduled to run on BBC Knowledge from 6pm to midnight on Sunday, sees the SAS recruitment process putting more members of the public through the ultimate physical and mental challenge. Only about 10 out of 125 professional soldiers will make it through.
Now, 18 men and six women - volunteers ranging from a chemist to a kung fu champion, from the early 20s to middle age - have made it through the screening.
Can they endure 10 days of hell in the Borneo jungle, as SAS soldiers recreate the brutal selection process in one of the most hostile environments on Earth?