We’re in that awkward seasonal window - the calendar says spring is coming. Race entries are open. The evenings are getting lighter.
But open water still feels a long way off.
If you’ve signed up for a summer swim event (like the Cotswold Big Swim Festival), now is the most important phase of your preparation. Not because you need huge volume, but because this is when consistency is built. And consistency now makes open water feel manageable later.
Why March and April Matter
Many athletes wait until lakes warm up before committing to swim training. By then, events are only weeks away and sessions become reactive rather than progressive.
Early spring is about laying foundations. Two or three swims per week - even if only 30–45 minutes - maintain feel for the water and build aerobic durability without overwhelming you. Fitness doesn’t need to spike right now. It needs to stabilise.
Technique Before Distance
Winter training often drifts into “lane survival” mode - ticking off lengths without much focus.
Use this period to refine the basics. Small technical improvements now make a huge difference outdoors where conditions are less forgiving.
Pay attention to:
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Relaxed, rhythmic breathing
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A stable head and body position
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A clean, efficient catch phase
The better your efficiency, the less energy you’ll waste when sighting, navigating and managing chop later in the year.
Add Controlled Intensity
Open water events rarely start gently. There’s usually a surge off the line, some jostling for space and a spike in heart rate.
To prepare, introduce structured intensity once or twice per week. Short threshold efforts, pace-controlled intervals and reduced-rest sets help simulate race demands without overloading your system.
Intensity should feel purposeful and not too chaotic.
Preparing for Open Water Before You Get In It
Even indoors, you can prepare for outdoor swimming. Try occasionally swimming without pushing off hard from the wall. Practise sighting every six to eight strokes so it becomes second nature. Swim in a busier lane to experience mild disruption and learn to hold your rhythm.
These small adaptations make your first open water session far less intimidating.
The Mental Shift Into the Season
Motivation naturally lifts when you have a clear target.
If you haven’t already, choose your event and commit. Having a defined goal transforms a cold Tuesday evening swim from a chore into purposeful preparation.
The athletes who feel most confident in June are usually the ones who built quiet consistency in March.
When to Transition Outdoors
As temperatures begin to rise in April, short open water sessions can be introduced gradually.
When you do head outdoors:
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Keep first sessions short and controlled
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Focus on acclimatisation rather than speed
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Never swim alone and ensure appropriate kit
Confidence grows quickly with exposure — but patience early on pays off.
Final Thought
By the time lakes look inviting, it’s too late to start building swim fitness from scratch.
Start now. Build rhythm. Improve efficiency. Stay consistent.
When race day arrives, you won’t just feel relieved to finish.
You’ll feel prepared.
