Tenacious Ten Endurance Challenge
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Event overview
The Tenacious Ten Hour Endurance Challenge takes place on Saturday 9 May 2026 at Mynydd Troed, Pengenfford Common near Talgarth, Powys (LD3 0EY). The event is organised by Limitless Trails and runs as a timed, loop-based endurance race over a strict 10-hour period. The route starts at the base of Mynydd Troed and includes several false summits on the climb, technical steep downhills, runnable sections and open common trails. The course is fully marked and has two clip stations on the route, at the trig point and at the base of the mountain.
Entries are open to solo runners, pairs and teams of four. Minimum age at the event date is 17. Entry fees listed are: Solo £55, Pair £100, Team of 4 £150. Entries opened 21 May 2025 and close 7 May 2026.
Race format, rules and facilities
Each lap is recorded by clipping a laminated card at the two stations. A strict 10-hour cut off applies; any lap not completed and recorded before the final horn will not count. Team totals are the collective number of laps completed; teams must be named and continue under a last-man-standing approach. Medics may withdraw participants; if allowed to continue they do so at their own risk.
Facilities at headquarters include a refuel zone at the start/finish with food and drinks, space for drop bags, toilets, basic camping nearby, parking (ballot and fee applies) and a full medical team. Mandatory kit requirements include waterproof jacket and trousers, race vest or pack with at least 2 litres capacity, charged mobile phone, hat and gloves, appropriate trail footwear, first aid kit, foil blanket, head torch and whistle with spare batteries, reusable cup and navigation file or map. Visit the organization's website for the most recent information.
