Swimmers in warm open water at an UltraSwim 33.3 event in Greece

Arrive Early. prepare. Start Ready.

Our onsite, pre-event preparation camps give you extra days in the water at your event location before the race begins allowing you to acclimatise to the conditions, connect with fellow swimmers, and arrive at the start line feeling confident. Our preparation camps offer a mix of pool (when available) coaching sessions, open water practice, recce of segments of the course, seminars, and individual consultations with our experts on nutrition, mobility, injury prevention - and the mental preparation side. Committed to the challenge, but really nervous? This could be for you. For the first time, from 2027 these will be available at every event.

View the editions How to book

At Event Camps

Coached Sessions, Open Water Practice, and a Community Ready to Race.

Each prep camp is led by one of our world-class coaches and is the perfect chance for you to develop you skills and most importantly, your confidence.

You’re NEW to UltraSwim 33.3 and want that extra boost of knowledge and preparation right before the event to help your confidence about what is coming up!
You’ve already done an UltraSwim 33.3, so you know the event, but you want to take the opportunity to hone your skills and be fully focused in on the event
You want a tune up of your technique, giving you a focus for the event on what to try to maintain even when you are getting tired.
You’ve done lots of pool swimming, but not sure how to adapt your technique in different open water conditions.
You will really benefit from a pre-event full mind and body check from our experts - you’ve maybe a niggling injury that you’d also like to get checked out to see how to prevent it becoming more of a pain!
You want to spend some extra quality time at the event, with amazing people!

How to book

UltraSwim 33.3 #10 Montenegro, coach Anna Karin demonstrating sighting

What every camp includes

UltraSwim 33.3 #12 Croatia, preparation camp with Marieke

Coached water sessions

Two structured days led by one or more of our Affiliate coaches. Small groups working on sighting, pacing and drafting, and navigation.

Precision Fuel and Hydration partnership with UltraSwim 33.3

The actual race course

You practise on the genuine course, not a substitute. Feel the currents, temperatures and the sighting lines exactly as they will be on race day.

UltraSwim 33.3 #10 Montenegro, swimmer feeding mid swim

Nutrition and physiology

Our nutrition partners and on site physiotherapists help you fuel, hydrate and move well, so you reach the start line fresh, mobile and fully prepared.

our 2027 preparation camps

#18greece [milos]

Hosted by Marieke Blomme

The preparation camp is lead by Ultra swimmer and Swim Smooth coach Marieke Blomme, who set the overall record along the Belgian coast line (67km) and swam Lake Geneva (70km). Co-Founder of the Belgian Coast Swim (16km) and OSC (the only open water sea swim club in Belgium). Marieke has also swum herself every UltraSwim 33.3 destination so far!‍

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#19Switzerland

Hosted by Tom Jenkinson

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Tom Jenkinson is one of our experienced UltraSwim 33.3 Affiliate coaches and will be leading a pre-camp in Switzerland ahead of our 2027 event. Tom will bring his coaching expertise, energy and understanding of the 33.3 format to help swimmers prepare both physically and mentally for the challenge ahead. The pre-camp will provide an opportunity to train together, refine open-water skills, build confidence and get to know fellow swimmers, while giving participants the ideal preparation and insight before taking on the full 33.3 challenge. He completed #14Switzerland in 2026 and used to live in the area - he's your perfect expert for #19Switzerland!‍

#20greece [skopelos]

Host coach TBC

In 2027, we will also offer prep-camp opportunities in Skopelos, giving swimmers the chance to arrive early, settle into the destination and prepare for the UltraSwim 33.3 challenge alongside fellow participants. Each prep-camp will combine structured training, open-water preparation and practical guidance around the 33.3 format, while also creating an opportunity to experience the destination before the event begins. Coaches will be confirmed in due course, with the aim of providing experienced and inspiring coaching support.

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#21Montenegro

Host coach TBC

In 2027, we will also offer prep-camp opportunities in Montenegro, giving swimmers the chance to arrive early, settle into the destination and prepare for the UltraSwim 33.3 challenge alongside fellow participants. Each prep-camp will combine structured training, open-water preparation and practical guidance around the 33.3 format, while also creating an opportunity to experience the destination before the event begins. Coaches will be confirmed in due course, with the aim of providing experienced and inspiring coaching support.

Download full details