Transitioning to
Open Water Swim Training
Every summer, athletes who've been grinding through pool sets all winter step into open water for the first time and immediately feel slower, less efficient, and less fit than they know themselves to be. Their aerobic system is fine. Their stroke is the same stroke. But something is off, and it usually takes two or three sessions to figure out what.
Here's what's off: the pool is a controlled environment with walls, black lines, lane lines, and a ceiling to orient yourself. Open water has none of that. Sighting disrupts your stroke rhythm. Wetsuits change your body position and your breathing mechanics. Cold water raises your heart rate before you even have the opportunity to settle in. The absence of a wall every 25 yards means you can't rest, reset, or take a split - you just keep swimming.
None of this is a fitness problem. It's a context problem. The transition from pool to open water is learnable, and it's faster than most athletes think when they approach it as a skill acquisition process rather than just "more swimming."
What Actually Changes Between Pool and Open Water
Understanding the differences precisely helps you train for them specifically, rather than just "getting more open water time" and hoping the discomfort resolves.
| Pool | Open Water | What It Means for You |
|---|---|---|
| Wall every 25–50 yards | No walls, no resets | You need sustainable aerobic rhythm, not interval-dependent fitness |
| Black line for navigation | Buoys, landmarks, other athletes | Sighting is a skill that costs stroke efficiency until it's automatic |
| Lane lines dampen chop | Current, chop, wakes | Stroke rate adaptation and hip rotation matter more than in flat water |
| Controlled water temp | Cold water, wetsuit decisions | First 200m heart rate spike is normal - it must be trained, not feared |
| Solo lane or predictable lane mates | Mass starts, contact, drafting | Emotional regulation at the gun is as important as physical preparation |
The Four Skills That Separate Good Open Water Swimmers
1. Sighting Without Breaking Rhythm
Sighting is the single biggest efficiency leak in open water swimming. Most athletes look up too high, too often, and for too long - each sight lifts the head, drops the hips, and interrupts the catch. The goal is a two-beat head movement: quick look forward during the recovery phase of one arm, face back in the water before the catch of the opposite arm. Done correctly, it adds almost nothing to your effort. Done incorrectly, it adds 5-10 seconds per 100 yards and leaves you more fatigued.
Practice this in the pool before you ever get in open water. Pick a point at the end of the lane. Sight every 8-10 strokes. Get the mechanics automatic before you add navigation complexity.
2. Managing the Cold Water Heart Rate Spike
Cold water triggers a cold shock response - heart rate spikes immediately, breathing becomes rapid and shallow, and the instinct is to fight the water rather than swim through it. This passes within 90-120 seconds if you let it. The athletes who struggle at mass swim starts are often athletes who panicked at this physiological response rather than recognizing it as temporary.
Train for it deliberately. If your race will involve cold water, include some cold water exposure in training. Know what the spike feels like. Know it resolves. Then it's information, not a crisis.
3. Bilateral Breathing Under Stress
In the pool, most athletes have a dominant breathing side. It works because the environment is predictable. In open water, sun angle, chop direction, and race position may require you to breathe to either side without warning. An athlete who can only breathe comfortably to the right is going to swim a crooked line and fight the water when conditions don't cooperate.
If bilateral breathing is underdeveloped, begin to address it in the pool. It will take four to six weeks of deliberate practice to make it feel more natural. Start with every third stroke. Then alternate sets. By race day it should begin to feel automatic. While it may not become your automatic go-to stroke pattern, it is a nice tool to have in your tool box, when needed.
4. Drafting Efficiently
Drafting in open water reduces your energy expenditure measurably - studies estimate 15-20% savings when positioned correctly. The draft pocket is at the feet of the swimmer directly in front of you, or hip-to-hip in a parallel position. Both require practice to hold under fatigue and race intensity. Include drafting practice in OWS sessions before the race season begins. It is a skill, not luck.
A 4-Week Open Water Transition Protocol
This protocol assumes one to two open water sessions per week, supplemented by pool sessions. The goal is progressive skill development and confidence building - not just logging OWS yardage.
What This Looks Like in the Pool While You Transition
Open water technique is built in the pool. Use your pool sessions this month with specific intent - not just fitness sets, but OWS preparation sets.
Bilateral breathing sets: Alternate 100s - breathe every 3 strokes for one length, every 2 for the next. Progress to full 200m sets breathing every 3 strokes comfortably.
No-wall sets: Swim 200-400m continuous without touching the wall at turns. Simulates the sustained aerobic demand of OWS where you can't rest, reset, or use the wall to fix your position.
Elevated heart rate starts: Start each set from a standing position at the wall with a fast 25m sprint, then settle into the target pace. Trains your body to manage the transition from elevated to controlled heart rate - exactly what the first 200m of any open water race requires.
The Confidence Component
Open water confidence is not a personality trait. It's a product of preparation. Athletes who feel anxious at mass swim starts almost always have one of three problems: inadequate open water exposure, unfamiliarity with their wetsuit, or a specific unaddressed skill gap (usually sighting, bilateral breathing, or cold water response) that creates uncertainty.
Address the skills deliberately. Log the sessions methodically. By week four of this protocol, open water should feel like the beginning of your race, not the most stressful part of it. The pool got you fit. Open water is where you apply that fitness under race conditions. That transition is worth investing in.
Four Tiers. One Framework.
If your summer race calendar is taking shape and your current training structure doesn't match the demand ahead, now is the time to evaluate your coaching setup.
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