Most swimming breathlessness is an exhaling problem, not an inhaling one. Correct breathing technique for swimming means exhaling continuously underwater so your lungs are already empty when you turn to breathe. Swimmers who hold their breath have no room to inhale and feel unfit within a length.
The mistake almost everyone makes
Beginners hold their breath with their face in the water, then turn to the side and try to
exhale and inhale in the fraction of a second the head is clear. There is not enough time. They get a
partial breath, carry a lung still holding stale air, and are gasping by the end of a length.
The physiological detail matters: the urge to breathe is driven far more by rising carbon dioxide
than by falling oxygen. Holding your breath keeps carbon dioxide in, which produces the desperate
feeling of needing air even when oxygen is fine. Swimmers describe this as being unfit; it is
actually being full.
The fix is to exhale steadily the whole time your face is in the water, through the nose or the
mouth or both. A continuous trickle of bubbles is what you are aiming for. When your mouth clears the
surface your lungs are already empty and the only job left is a quick inhale, which fits comfortably
in the time available.
How do I time the head turn to breathe when swimming?
You breathe by rotating your body, not by lifting your head. The rotation of the torso brings
your mouth to the surface almost as a by-product, and one goggle should stay in the water while the
other clears. Swimmers who lift the head instead drop their hips, which adds drag exactly when they
are least able to afford it.
The turn happens as the arm on that side is recovering. Head follows the shoulder round, mouth
clears, quick inhale, head returns before the hand enters. Getting the head back early is what most
swimmers do late, and a head still turned when the hand enters means the body is out of alignment for
the strongest part of the stroke.
The useful cue is to look sideways rather than forward, at the wall or the lane rope. Looking
forward to breathe is the single most common way swimmers lift their head. More stroke detail is in
How to Improve Your Freestyle Technique.
What is bilateral breathing actually for?
Bilateral breathing means breathing to alternate sides, usually every third stroke. Its purpose
is symmetry rather than fitness. Swimmers who breathe only to one side develop a stronger pull on the
other, rotate further one way than the other, and often track slightly off a straight line without
noticing.
That asymmetry costs little in a lane with a black line to follow and costs a great deal in open
water, where a swimmer who veers consistently to one side adds real distance. It is also a common
source of shoulder irritation on the favored side over a long season.
The practical approach is to train bilaterally and race or swim hard to whichever side is more
comfortable. Breathing every third stroke reduces total breaths, which is fine at an easy pace and
becomes limiting at a hard one, so many swimmers alternate sides by length instead.
What drills fix breathing directly when swimming?
Bubble drill. Stand in shallow water, face in, exhale slowly and completely for
several seconds, lift, inhale, repeat. This builds the habit with no other task competing for
attention, and it is where the pattern should be learned rather than mid length.
Vertical kicking with breath control. Tread water using only the legs while
practicing a slow steady exhale and quick inhale. It reproduces the timing pressure of swimming
without the coordination load of the arm stroke.
Single arm freestyle. One arm at your side, the other stroking, breathing to the
stroking side. Removing half the stroke frees enough attention to actually notice what your head is
doing, which is normally invisible from inside the full stroke.
Key takeaways
- Breathlessness in swimming is usually a failure to exhale, not a failure to inhale.
- The urge to breathe is driven by rising carbon dioxide, so holding your breath creates air hunger.
- Exhale continuously underwater so your lungs are empty when the mouth clears the surface.
- Breathe by rotating the body, not by lifting the head; one goggle stays in the water.
- Look sideways rather than forward, because looking forward is how swimmers lift the head.
- Get the head back before the hand enters, or the body is misaligned for the strongest part of the pull.
- Bilateral breathing is about symmetry, not fitness, and it pays off most in open water.
- Nasal exhalation makes water going up the nose physically impossible.
- The standing bubble drill teaches the habit with nothing else competing for attention.
- Skipping breaths to seem fitter degrades technique and builds nothing.
Symptom, real cause, and the fix
| Symptom | Real cause | Fix |
|---|---|---|
| Gasping after 25 yards | Breath held underwater, carbon dioxide rising | Exhale continuously, bubbles the whole time |
| Only getting half a breath | No time to exhale and inhale in one turn | Empty the lungs before the head turns |
| Hips sinking when breathing | Lifting the head instead of rotating | Look sideways, keep one goggle in the water |
| Water in the mouth on inhale | Head lifted, bow wave missed | Rotate further, breathe into the trough beside the head |
| Veering off line in open water | Breathing to one side only | Train bilaterally, alternate sides by length |
| Dizzy after hard swimming | Over breathing or breath holding cycles | Steady rhythm, do not skip breaths to look fit |
Want to book a class?
Call (516) 872-4571. We teach at 490 Sunrise Highway, Rockville Centre, NY 11570.
Frequently asked questions
Should I breathe through my nose or mouth?
Exhale through either or both underwater, and inhale through the mouth. Nose exhaling suits people bothered by water entering the nose; the important part of breathing technique for swimming is that you exhale at all.
How often should I breathe?
Every two or three strokes for most swimming. Every three trains symmetry, every two supplies more air at hard efforts. Deliberately skipping breaths does not build fitness and does degrade technique.
Why do I feel out of breath after one length?
Almost always breath holding. Carbon dioxide builds up and produces air hunger that feels exactly like poor fitness. Continuous exhalation underwater usually fixes it within a session or two.
Is bilateral breathing necessary?
Not for pool fitness, but it is worth training. One sided breathing builds asymmetry in rotation and pull that costs distance in open water and can irritate the favored shoulder over a season.
Why does water go up my nose?
You are not exhaling through it. A steady stream of nasal bubbles makes water entry physically impossible, which is why the standing bubble drill solves this faster than any equipment does.
Should I lift my head to breathe?
No. Rotate the body and let the mouth clear as a result. Lifting the head drops the hips and adds drag at the moment you are already working hardest, which makes the next breath harder still.
What is a bow wave and why does it matter?
A moving swimmer pushes a small wave ahead, leaving a trough beside the head. Breathing into that trough means less rotation is needed, which is why faster swimmers appear to barely turn at all.
Can I practice breathing outside the pool?
Somewhat. Slow controlled exhalation over five or six seconds is trainable anywhere and transfers. The timing under the pressure of a stroke cycle, though, only develops in water.
