GUIDES/ULTRA

HOW TO TRAIN FOR YOUR FIRST ULTRA.

An ultra marathon is any race longer than 26.2 miles (42.2km). Most UK ultras are 50km, 50 miles, or 100km. It sounds impossible until you realise the secret: ultras are not about speed, they're about moving forward. If you can run a marathon, you can run an ultra with the right preparation.

Step by Step
01

Run a marathon first (or at least train for one)

You need a solid base of 40-50km per week before starting ultra training. If you haven't run a marathon, do one first — or at least complete a 16-week marathon training block. The marathon base teaches you to manage fatigue, nutrition, and mental resilience over hours, not minutes.

02

Increase weekly volume, not intensity

Ultra training is about time on feet, not speed. Build to 60-80km per week over 12-16 weeks. Most runs should be easy pace (you can hold a conversation). Add 10% per week maximum. One long run per week: build from 25km to 40km+. Back-to-back long runs on weekends (e.g. 30km Saturday, 20km Sunday) simulate ultra fatigue.

03

Train on similar terrain to your race

If your ultra is hilly, train on hills. If it's trail, train on trail. Flat road ultras (like Thames Path) are more forgiving for first-timers. Browse ultra events to pick a race, then train on similar terrain. UK ultras with good reputations for first-timers: Centurion Running, Ultra X, Lakeland series.

04

Master your nutrition strategy

You cannot run an ultra on gels alone. After 4+ hours, you need real food: sandwiches, potatoes, rice cakes, soup, bananas. Train your stomach by eating during long runs. Target: 200-300 calories per hour. Practice what you'll eat at aid stations. Never try new food on race day.

05

Build your mandatory kit list

Most UK ultras require mandatory kit: waterproof jacket, emergency blanket, whistle, headtorch (for overnight races), 1L water capacity, phone, basic first aid. A running vest with 10-12L capacity fits everything. Test every piece of kit on training runs — chafing at mile 30 is a race-ender.

06

Train your mind

At some point in an ultra, you will want to quit. This is normal. Break the race into checkpoints, not total distance. Walk the uphills from the start — walking is a strategy, not a failure. Listen to your body: genuine injury is a reason to stop, being uncomfortable is not. Talk to other runners — the ultra community is the friendliest in endurance sport.

07

Taper and race strategy

Two-week taper: cut volume by 40% in week 1, 60% in week 2. Race strategy: start slower than you think. If your target is 10 hours, run the first quarter at 12-hour pace. Eat at every aid station even if you're not hungry. Change socks at halfway if the race offers a drop bag. Walk all hills over 10% gradient from the start.

Frequently Asked
How long does it take to train for an ultra marathon?
16-24 weeks on top of a marathon base. If you're coming from marathon fitness, 16 weeks is enough for a 50km. For 100km or 100 miles, allow 24+ weeks. Most people spend 6-12 months building from marathon to ultra.
What's a good first ultra marathon in the UK?
50km on a well-marked, relatively flat course. Centurion Running's SDW50 (South Downs), Thames Path 50km, and the Cotswold Way Challenge are popular first ultras. Browse ultra events for upcoming races.
Can I walk in an ultra marathon?
Yes — and you should. Walking uphills, walking through aid stations, and power hiking are standard ultra strategies used by every level of runner including elites. Run the flats and downhills, walk the uphills.
How much does an ultra marathon entry cost?
50km: £40-80. 50 miles: £60-120. 100km: £80-150. 100 miles: £100-250. Prices include aid stations with food and drink. Check ultra events for current pricing.

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