Quick Answer: Most adult breathing problems in front crawl are exhale problems, not inhale problems. Holding your breath underwater leaves your lungs full of carbon dioxide, so the moment you turn to the side you have to exhale and inhale in the same fraction of a second, which is impossible. Breathe out steadily underwater and the panic disappears within two sessions.

You can float. You can move. You can do a length of breaststroke without a thought.

Then you try front crawl and by the fourth stroke you are gasping, standing up, and privately wondering whether adults can actually learn this.

They can. The thing going wrong is almost never the part you think it is.

What is actually causing the panic?

Carbon dioxide, not lack of oxygen.

When you hold your breath with full lungs, oxygen stays available for far longer than most people assume. What builds is carbon dioxide, and CO2 is what triggers the urge to breathe. That urgent, panicky need for air at stroke four is a CO2 signal, not an oxygen emergency.

So you turn your head to breathe and you have a problem. Your lungs are still full. Before you can take any air in, you have to get the old air out, and the window when your mouth is clear of the water is perhaps half a second.

You cannot exhale and inhale in half a second. So you get a partial breath, roll back in still holding most of the old air, and arrive at the next breath in a worse position than the last one. Three or four strokes of that and you stand up.

This is why the standard advice - relax, take a bigger breath - makes it worse. A bigger inhale means more air to get rid of next time.

Children rarely develop this problem because they are usually taught to blow bubbles before they are taught anything else. Adults arrive with a lifetime of instinct that says keep the air in when your face is in water, and that instinct is the whole obstacle.

What does a correct exhale look like?

Continuous, unhurried, and starting the moment your face goes back in.

The pattern to aim for is: breathe in through the mouth during the brief window at the side, then exhale steadily through nose and mouth for the entire time your face is in the water. Not a hold followed by a rush at the end. A slow leak the whole way through.

By the time your head turns again, your lungs should be close to empty, and the window is then used entirely for inhaling - which is achievable in half a second.

A useful check is whether you can hear yourself. A proper exhale is audible as a steady stream of bubbles. If your breathing is silent underwater and then noisy at the surface, you are holding and dumping.

Some coaches teach a nose-only exhale, some mouth, and both work. What matters is that it is continuous. Nose-only tends to be too slow for hard swimming, so most people end up nose-and-mouth as pace increases.

One complication worth naming: exhaling underwater feels wrong to a beginner because it removes buoyancy from your chest and your legs sink slightly. That sinking is normal, it is manageable with a small kick, and it is temporary - it stops being noticeable once the rest of the stroke settles.

5 Mistakes Adult Beginners Make With Breathing

1. Lifting the head instead of rotating. Lifting the head to breathe drops the hips, kills your position, and adds enormous drag. The head should rotate with the body, with one goggle staying in the water. Almost every adult lifts at first.

2. Trying to breathe every two strokes from day one. Breathing every two puts you on one side constantly and demands a fast, reliable exhale you do not yet have. Every three is easier to learn on and produces a more balanced stroke, even though it feels like less air.

3. Waiting until the head turns to start the exhale. This is the core error and it survives in swimmers who have been going for years. The exhale starts the instant the face returns to the water, not a moment later.

4. Taking a huge breath in. A full lung of air is uncomfortable, hard to get rid of, and unnecessary. A normal, relaxed breath is plenty, and it makes the next exhale far more manageable.

5. Practising the breathing while swimming. Breathing is the hardest part of the stroke, so trying to fix it while also managing arms, legs, and body position rarely works. It needs isolating, which is what the drills below are for.

How do you actually fix it?

Take the breathing out of the swimming and rebuild it on its own. Two or three sessions of ten minutes will usually do it.

Start with bobbing in the shallow end. Stand, take a normal breath, submerge, exhale steadily and audibly until empty, then stand and inhale. Twenty repetitions. This teaches the timing with nothing else to think about, and it is the drill most adult swimmers skip and most need.

Then do the same holding the wall, face down, rotating to the side to breathe. Same continuous exhale, breathe by rotating rather than lifting. Twenty more.

Then add a kickboard. Face in the water, kicking gently, exhaling continuously, rotating to breathe every three kicks. This is where the position of the head gets fixed - one goggle in, one out.

Then swim, and count. Breathe every three strokes, and count your exhale in your head so it stays continuous. Counting is the trick that stops the exhale from turning back into a hold under pressure.

And slow everything down. Adults almost universally swim front crawl too fast for their fitness, which raises CO2 production and makes the breathing problem worse. Half your normal effort, and the breathing gets easier immediately.

A lesson with a coach who watches your exhale specifically is worth a great deal here. It is very hard to know what you are doing underwater without someone watching from the side, and this is one of the few things in swimming where a single session of feedback can change everything.

FAQ: Adult Swimming Breathing Questions, Answered

Should I breathe on both sides?

Bilateral breathing produces a more even stroke and is worth learning, and it is not where beginners should start. Get a reliable exhale and a comfortable breath on your strong side first, then add the other side once the panic is gone.

Why do I feel fine for a length and terrible on the second one?

Usually because you started with a large breath and an incomplete exhale, so CO2 accumulates across the length. It shows up on the second one because the deficit is cumulative. Fixing the exhale fixes the second length.

Do I need to be fitter to swim front crawl?

Less than people think. Front crawl is a technique-limited stroke for almost every beginner, and adults who are fit in other sports are often the most frustrated because their fitness is not the constraint. Work on the exhale before you work on conditioning.

TL;DR:

• The urgent need to breathe is a carbon dioxide signal from holding your breath, not a lack of oxygen.
• If your lungs are full when you turn, you have to exhale and inhale in half a second, which cannot be done.
• Exhale continuously and audibly the whole time your face is in the water, and use the breathing window only to inhale.
• Isolate the skill with bobbing and wall drills, breathe every three, take a normal breath rather than a big one, and slow down.

Adults do not fail at front crawl because they are too old or too stiff. They fail because nobody told them the problem is the air they are keeping in.