About

The Tenacious Ten Ultra is a brutally demanding mountain challenge built around repeated loops from the base of the hill to the summit of Pen Cerrig-calch and back. The course opens with a punishing climb, then threads onto technical trails and steep ascents before topping out amid expansive views that stretch across the surrounding peaks, including Pen Y Fan. Fast descents add another layer of difficulty, making each lap a test of both climbing strength and downhill control. The atmosphere is intense and determined, with runners pushing deep into their reserves as fatigue builds over successive loops. It is a race that rewards grit as much as fitness, combining harsh elevation, rugged terrain, and relentless pressure into a true examination of endurance and mental toughness. On-site physiotherapy support helps competitors manage the strain, while the team format adds a shared, tactical edge to the day.