The Swim Detective: The Case of the Vanishing Oxygen

The Swim Detective: The Case of the Vanishing Oxygen

Last week, the Swim Detective cracked the curious case of the missing seconds, revealing how a subtle slip in the catch had been quietly stealing speed in the pool. Swimmers celebrated their regained rhythm and the promise of faster times.

But no sooner had the applause faded than a new mystery surfaced – one that leaves even the strongest swimmers gasping mid-set. Lungs burned, energy flagged, and every breath felt like a struggle. 

What invisible force was making endurance vanish so suddenly? 

The Case of the Vanishing Oxygen had arrived, and it was up to the Swim Detective to uncover the culprit.

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The swimmer felt strong at the start of the set, powering through the first few 100s. But by the middle, lungs were burning, energy fading, and every breath felt like a battle.

Where had all the oxygen gone?

The Swim Detective arrived, and lined up the usual suspects:

Panic or tension – gripping the water too tightly, shoulders high, relaxation absent. A minor accomplice, but not the main thief.

Overexertion – pushing too hard at the start. Slightly guilty, but not the full story.

Stroke inefficiency – small leaks in propulsion, some mid-set drag. Contributed a bit, but not the true culprit.

Kicking – Using the legs too much, creating a high heart rate and a higher oxygen demand. A problem, but not the main suspect.

Breathing – breathing pattern erratic, holding breath, not exhaling properly underwater.

And there it was – the primary culprit. Ineffective Breathing had been quietly robbing the swimmer of oxygen, limiting endurance and making every set feel harder than it should.

The solution: breathe frequently (every two or three strokes), never hold your breath underwater and when head is under the water, exhale gently throughout. Once corrected, oxygen flow returned, endurance improved, and the mystery was solved.

Case cracked. Solved and sealed.

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Coach’s Corner – Key Breathing Cues

Even small inefficiencies in breathing can dramatically affect performance. Notice the fit athlete who wants to start swimming but complains about ‘being gassed’ after 25m. That’s not a fitness issue, that’s a breathing issue. 

Focus on these two key cues:

1. Exhale underwater: Make sure you start exhaling immediately, releasing the air before turning to breathe. This keeps oxygen flowing efficiently.

2. Breathe frequently: Every two or every three strokes – avoiding the need for deep breaths and waiting a while for fresh oxygen.

Keep these in mind during sets, and you’ll feel the difference immediately – oxygen stays in, fatigue drops, and speed returns.

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Further Reading

If you want to read more about breathing and breathing patterns, including some sets to do that will help you develop this part of your stroke further, we’ve produced this article for you.

Swimming Technique: Breathing

I hope you enjoyed the second case in our Swim Detective series. If you have any feedback, I would love to hear it.

Let’s keep improving our swim together!