If your idea of exercise is getting up from the couch to fetch the remote, then you’ll cringe at the thought of the Land Rover G4 Challenge.

With off-road driving at its core, the exciting global adventure race, run in conjunction with the British Red Cross Society, tests competitors’ mental and physical abilities over 1550 miles and 600 hours (in just three weeks) in some of the harshest environments known to man.

After taking several wrong turns onto roads that don’t actually exist (thank you sat-nav), I arrive at Eastnor Castle in Herefordshire to watch the national selections. Here it’s the top two men and top two women who go through to international selections.

From there, only one man and one woman will represent Britain at the Challenge finals in Mongolia in June next year.

Upon arrival at the picturesque Malvern Hills estate I am immediately lured into a bright-orange Discovery 3 with the promise of a Mars Bar and Land Rover branded fleece. The Disco then conveys us to a water-logged quarry, where I meet up with Challenge hopeful Campbell Walsh.

There was only time for small talk as it’s his turn to do the timed slalom kayaking course. It’s no coincidence that Walsh posts the best time out of the 24 competitors, because the man recently bagged the slalom canoeing silver medal at the Beijing games.