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Heat Acclimatization Before a Summer Ultra: Why You Can't Just Hope for Cool Weather
The biggest summer ultras — Western States, Hardrock, Leadville, UTMB — send athletes through environments where heat is a primary physiological stressor, not a background variable. Arriving without deliberate heat preparation is a choice that shows up in the canyons, not on paper.
By ZealZag Team
Western States 100 2026: Bouillard and Lichter Shatter Course Records
Vincent Bouillard destroyed Jim Walmsley's 2019 course record by 23 minutes as Jenn Lichter won her 100-mile debut in a historic performance at the 2026 Western States Endurance Run.
By ZealZag TeamRacing UTMB as a Foreign Athlete: The Practical Logistics of Arriving in Chamonix
Thousands of international athletes race the Ultra-Trail du Mont-Blanc every August, and the non-athletic logistics — accommodation, gear registration, jet lag, drop bags, crew access across three countries — are as demanding as the training. A practical guide to getting to the start line organised.
By ZealZag TeamFlying to Your Ultra: Kit Compliance, Drop Bags, and What Overseas Race Registration Actually Looks Like
The running in an ultra is the part you're most prepared for. The administrative layer — mandatory kit compliance, medical documentation, drop bag logistics, overseas registration, and jet lag before a 5am start — is where first-timers lose hours and sleep. Here is what it actually looks like.
By ZealZag Team
Race the Route: Running Trail 100 Andorra's 105K Pyrenean Circuit
Trail 100 Andorra by UTMB sends 105K runners through every parish of a micro-nation built from mountains. A practical guide to the Ultra 105K course, logistics, gear, and what makes the Andorran Pyrenees worth the journey.
By ZealZag Team
Trail 100 Andorra by UTMB 2026: 6,900m Into the Pyrenean Roof
Four days before the Ultra 105K gun goes off at Ordino, Trail 100 Andorra by UTMB is already generating the quiet intensity of a race that knows exactly what it is: 105 kilometres and 6,900 metres through the highest country in the Pyrenees.
By ZealZag Team
More Than Kilometres: Antonio Jaén and Twenty-Four Years on the Mountains of Cehegín
Twenty-four years after his first run, Antonio Jaén still wakes before sunrise with the same excitement to meet the mountain. A portrait from the Sierras del Noroeste of Murcia.
By ZealZag TeamChamonix for Trail Runners: The UTMB Corridor and What the Trails Actually Ask
Chamonix sits at 1,035 metres in the Arve Valley, hemmed in by the biggest peaks in the Western Alps. Trail running here operates on three distinct altitude bands, from accessible afternoon runs at 2,000m to technical high-altitude routes that ask for more than aerobic fitness.
By ZealZag Team