The UK's

toughest triathlonSWIM 5km–BIKE 1,000km -RUN 50km

8 June – 14 June 2025

Swim, cycle and run over 1,055 km from Loch Ness to London and tackle this seven-legged beast!


the event

Spanning 7 days, the Monster Triathlon is the UK’s ultimate multi-sport challenge

The Monster Triathlon offers the ultimate epic endurance challenge, returning in June 2025. Your challenge begins when you take on a 5km swim in Loch Ness, before 5 stunning days on the bike and the final push into London – a 50k ultra-marathon.

As you tackle the challenge of the Monster Triathlon you’ll conquer the very best the UK has to offer, from epic mountain passes in the Scottish Highlands to the expansive lakes of the Lake District, from the rolling Chiltern hills to idyllic villages in the midlands before a grand finish in the capital. Our monster challenge will showcase the beauty and diversity of the UK as you take on our 1,055km beast.

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GOld Charity PartnerSabre EDUCATION

This fantastic small charity work with kindergarten children in Ghana and help give them a bright start to their education. Register as a Sabre fundraiser and receive half price entry if you pledge to raise £2,000 sponsorship.

So what are you waiting for... your next big challenge starts here!

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Kindergarten children in Ghana