Bilateral breathing means breathing to both sides while you swim freestyle — typically by taking a breath every three strokes so you naturally alternate left and right. If you’ve only ever breathed to one side, learning to breathe both ways can feel awkward at first, but it’s one of the most useful upgrades you can make to your stroke.

The short answer

Bilateral breathing is the habit of alternating your breathing side, usually every three strokes, instead of always turning to the same side. It builds a more symmetrical, balanced stroke, keeps your body from favoring one side, and gives you options — like breathing away from choppy water or another swimmer. Learn it slowly on your weaker side first, keep the effort easy, and don’t force it while you’re gasping.

Why bother breathing to both sides

Always breathing to one side isn’t wrong, but it quietly builds imbalance. You tend to pull harder on your breathing side, over-rotate one way, and swim in a subtle curve. Learning both sides evens all of that out.

The real payoffs are:

  • A balanced stroke — your pull and body rotation become more symmetrical.
  • Flexibility — in open water you can breathe away from waves, sun, or a nearby swimmer.
  • Better body awareness — you notice and fix your weaker side instead of hiding it.

You don’t have to abandon single-side breathing forever. Think of bilateral as a tool you add to your kit, not a rule that replaces everything else.

Fix your weaker side first

Almost everyone has a “good” side and an awkward one. Before you try alternating, spend time just breathing to the side you dislike.

  1. Push off gently and swim slowly, breathing only to your weaker side for a length.
  2. Focus on rotating your whole body, not craning your neck.
  3. Keep one goggle in the water as you turn — you’re rotating to find air, not lifting your head.

It’ll feel clumsy for a while. That’s completely normal. Give your weaker side dedicated practice and it’ll catch up faster than you expect. If the basic breathing rhythm still trips you up, how to breathe while swimming for beginners is the foundation to nail first.

The every-three-strokes rhythm

Bilateral breathing usually runs on a “breathe every three strokes” count. Because three is an odd number, you automatically end up alternating sides.

Count your arm strokes as they enter the water: one, two, three — breathe. Then one, two, three — breathe to the other side. Left, right, left, right, every three pulls.

Keep exhaling steadily through those three strokes so your lungs are ready when it’s time to turn. The most common mistake is holding your breath during the longer gap — that’s what leaves people gasping. A slow, continuous trickle of bubbles the whole time solves it.

Keep the effort easy while you learn

The reason bilateral breathing feels exhausting at first is simple: you’re breathing less often than you’re used to, so any oxygen shortfall shows up fast. The trick is to learn it when you’re not working hard.

  • Practice it during easy, relaxed swimming — never during a flat-out effort.
  • Do it in short bursts: a length of bilateral, then a length of comfortable single-side breathing.
  • If you start to feel starved for air, drop back to breathing every stroke and try again fresh.

There’s no prize for suffering through it. Layer it in gently and your body adapts to the longer rhythm naturally.

Common mistakes to avoid

A few habits sabotage bilateral breathing more than anything else:

  • Lifting the head instead of rotating — this sinks your hips and throws off your whole stroke. Turn your head with your body roll, keeping it low.
  • Holding your breath between breaths — always exhale continuously; never bank air.
  • Forcing it when fatigued — grinding it out while gasping just teaches panic. Ease off and rebuild.
  • Ignoring the weaker side — if you only ever practice your good side, you’re not really breathing bilaterally.

For more habits worth catching early, common swimming mistakes beginners make covers the ones that hold most people back. And once your breathing is comfortable both ways, how to swim freestyle step by step ties it into the whole stroke.

A quick safety note

Practice new breathing patterns where you feel secure — within your depth, in a lane or lifeguarded pool, and never alone in open water. Bilateral breathing should feel calm, not like a breath-holding test. If you ever feel light-headed, stop, rest, and go back to breathing as often as you need.

The next small step

Next time you swim, pick just your weaker side and swim one slow, easy length breathing only that way. Don’t worry about alternating yet — simply get comfortable finding air on the side you usually avoid. Once that feels less strange, add the every-three-strokes count. Small, patient reps are exactly how bilateral breathing turns from awkward into automatic.