Open water swimming vs pool swimming is a bigger jump than the distance suggests. Nothing about your fitness changes, but cold, chop, no walls, no line to follow and limited visibility all do. Confident pool swimmers regularly struggle on their first open water swim, and it is entirely predictable.
What actually changes when you swim in open water instead of a pool?
The pool gives you five things you stop noticing until they are gone: warm still water, a black
line to follow, a wall every twenty five yards, clear visibility, and a lifeguard who can see you at
all times. Open water removes all five simultaneously.
Cold is the biggest single factor and the one people underestimate most. Water in the low fifties
Fahrenheit produces an involuntary gasp on entry, raises breathing rate sharply, and reduces the useful
duration of a swim far more than fitness does. It is a physiological response, not a mental weakness,
and it happens to experienced swimmers too.
The absence of a wall matters more than expected. In a pool you rest every length whether you
intend to or not. In open water there is no natural pause, so a swimmer who is used to touching and
pushing off finds their effective continuous distance is far shorter than their pool distance
suggested.
How do I handle a cold entry properly in open water?
Enter slowly and let the cold shock response pass before swimming. It typically peaks within
the first minute or two: rapid involuntary breathing, a racing heart and the strong sense that
something is wrong. Waiting it out in shallow water, breathing deliberately, is the difference
between a good swim and a frightening one.
Do not dive or jump in cold water. Sudden immersion is exactly what triggers the response most
violently, and it is a recognized cause of drowning in otherwise capable swimmers. Wade in, wet your
face and neck, and wait.
A wetsuit adds warmth and buoyancy, and the buoyancy is a genuine safety margin rather than a
comfort. Local water is cold for much of the year, which is covered in
Cold Water Diving: What Changes and, for suit
choice, How to Choose a Wetsuit for
Diving.
Why is swimming straight hard in open water?
Without a black line, most swimmers veer. Which way you veer is usually determined by which side
you breathe to, which is the practical argument for bilateral breathing that pool swimmers can
comfortably ignore for years.
Sighting means lifting the eyes just clear of the water to check direction, then returning the head
immediately. The efficient version is to raise the eyes only, take one look, and let the head drop
into a normal breath on the next stroke. Lifting the whole head drops the hips and costs far more than
the correction was worth.
Sight more often than feels necessary at first, roughly every six to ten strokes. Correcting a
small deviation early is cheap; discovering a large one after fifty strokes is expensive, and swimming
extra distance is the most common reason open water swims take much longer than the pool equivalent.
Doing it safely
Never swim alone in open water. This is not a soft recommendation: the failure modes are cold
incapacitation and cramp, both of which remove your ability to self rescue while leaving you
conscious and aware. A companion, ideally one on a paddleboard or kayak, is the control that matters.
Use a brightly colored tow float. It does not slow you meaningfully, it makes you visible to boats
and to people on shore, and it gives you something to hold if you need to stop. Swim parallel to shore
rather than out and back, so you are never far from an exit.
Know the conditions before entering: current, tide, water temperature, boat traffic and any local
hazards. Rip currents are the most commonly misunderstood of these, and the
National Weather Service rip current guidance explains how they behave and how to escape one.
Key takeaways
- Open water removes warm still water, the black line, the walls, visibility and the lifeguard at once.
- Cold is the biggest factor and reduces swim duration far more than fitness does.
- Wade in and let the cold shock response pass; never dive or jump into cold water.
- No walls means no involuntary rest, so continuous distance is much shorter than your pool distance.
- Most swimmers veer toward their breathing side, which is why bilateral breathing matters here.
- Sight by lifting only the eyes, every six to ten strokes, then drop into a normal breath.
- Extra distance from veering, not lost speed, is usually why open water swims take longer.
- Never swim alone; cold incapacitation and cramp leave you conscious but unable to self rescue.
- Use a bright tow float and swim parallel to shore so an exit is always close.
- Check current, tide, temperature and boat traffic before entering, every time.
What changes and what to do about it
| Factor | Effect | Response |
|---|---|---|
| Cold water | Gasp response, higher breathing rate, shorter swims | Enter slowly, wait out the first minutes, consider a wetsuit |
| No walls | No involuntary rest every length | Expect much shorter continuous distance than in the pool |
| No black line | Veering, often toward your breathing side | Sight every 6 to 10 strokes, train bilateral breathing |
| Poor visibility | Disorientation, anxiety | Accept it, use a tow float, swim parallel to shore |
| Chop and swell | Breathing timing disrupted, water inhaled | Breathe into the trough, sight less often in rough water |
| No lifeguard watching you | No one notices a problem | Never swim alone; use a companion or support craft |
Want to book a class?
Call (516) 872-4571. We teach at 490 Sunrise Highway, Rockville Centre, NY 11570.
Frequently asked questions
Is open water harder than pool swimming?
Different rather than harder, but it feels harder at first. In open water swimming vs pool swimming the fitness carries over and the environment does not, which is why strong pool swimmers still struggle initially.
How cold is too cold without a wetsuit?
Below roughly sixty degrees Fahrenheit most swimmers want a wetsuit, and below thirteen it becomes a safety item rather than a comfort one. Tolerance varies widely, and it drops with fatigue.
What is cold shock?
An involuntary gasp and rapid breathing on sudden immersion, peaking in the first minute or two. It is a recognized drowning cause in capable swimmers, which is why you wade in rather than jump.
How do I swim straight without a line?
Sight every six to ten strokes by lifting only the eyes, then dropping straight into a normal breath. Correcting small deviations early costs far less than fixing a large one later.
Do I need a tow float?
Effectively yes. It costs almost nothing in speed, makes you visible to boat traffic and observers on shore, and gives you something buoyant to hold if you need to stop and rest.
Can I swim alone if I stay close to shore?
No. Cold incapacitation and cramp both remove self rescue while leaving you conscious, and close to shore is still out of reach if nobody is watching. Swim with a companion every time.
Why is my open water pace so much slower?
Usually extra distance from veering rather than a genuine drop in speed. Swimmers routinely cover noticeably further than the course length, which is why sighting technique pays back so quickly.
What about currents and tides?
Check before you enter and plan to swim against any current first, so the return is assisted. Swimming parallel to shore keeps an exit close throughout and is the sensible default.
