There’s a particular flavour of embarrassment that every newer diver knows: you’re the one who signals “low on air” first, while your buddy cruises along with half a tank left, looking annoyingly relaxed. You start to wonder if there’s something wrong with you. Bigger lungs? Bad genetics? A slow leak somewhere?

Here’s the good news, and we mean it: air consumption is mostly a skill, not a fixed trait. The divers sipping slowly from their tanks weren’t born that way — they built it, dive by dive. Which means you can too. Here’s what actually drives how fast you go through a tank, and the habits that genuinely fix it.

First, kill the myth

It is not mainly about lung size. Yes, a bigger person generally uses somewhat more gas than a smaller one, and there’s nothing to be done about your body. But that difference is small compared to the things you can control. We’ve watched big divers with great technique out-last small divers with poor technique, over and over. So stop blaming your ribcage. The real levers are elsewhere.

The big one: buoyancy and trim

If you fix one thing, fix this. Here’s the chain of cause and effect that wrecks most new divers’ air consumption.

You’re a little over-weighted, or your buoyancy control isn’t dialled, so you’re subtly fighting to hold your depth. That fighting means constant small fin kicks and arm movements. That movement is muscular work, work burns oxygen, and burning oxygen means breathing harder and faster. On top of that, if you’re not horizontal — if you’re angled head-up, as most new divers are — every fin kick drives you upward, so you’re finning even more just to stay level.

Get properly weighted (usually that means less lead than you think), get neutrally buoyant, and get flat and horizontal in the water, and suddenly you’re not working at all. You’re just hanging there, breathing slowly, going nowhere you don’t intend to. Divers are consistently shocked at how much air they save the day their buoyancy finally clicks.

Slow everything down

New divers move too much and too fast. Fast fin kicks, rushing from one thing to the next, hands sculling constantly for balance. All of it burns gas.

The best divers look almost lazy. Slow, deliberate fin kicks with long glides between them. Hands still — often just folded — because their buoyancy is doing the work their hands used to. When you stop treating the dive like you’re in a hurry, your breathing settles, and your gas lasts dramatically longer. Underwater, slow is efficient.

Breathe properly (not less)

Important safety point first: the goal is never to hold your breath or skip-breathe to save air. That’s dangerous, full stop. Never do it.

What you want instead is slow, deep, relaxed breathing. Long, full inhale; long, controlled exhale. Shallow, rapid panting is inefficient — it moves a lot of air past the parts of your lungs that actually exchange oxygen without doing much useful work. Slow deep breaths use each lungful properly. A calm, deliberate breathing rhythm is one of the fastest wins available, and it doubles as a way to keep yourself relaxed.

Relax — genuinely

Anxiety is a gas hog. A tense diver breathes faster, moves more, and burns through a tank. A relaxed diver just… doesn’t. Early on, some nervousness is completely normal, and it fades with dives. Everything that builds comfort — logging more dives, diving familiar sites, a refresher if you’ve been away, going with a guide you trust — pays off directly in air consumption. This is a big reason your air lasts longer at dive fifty than it did at dive five, without you consciously changing anything.

The smaller levers

A few more that add up. General fitness helps — a body that isn’t straining does everything more efficiently underwater. Staying warm matters too; being cold makes you burn energy, so the right exposure protection for the conditions genuinely affects your gas. And correct weighting deserves a second mention, because over-weighting quietly sabotages everything above it.

Give it time, and track it

Here’s the encouraging part: you don’t have to fix all of this at once. Work on buoyancy for a few dives, then slow down, then focus on your breathing. Each one moves the needle. If you dive a computer that logs your air, watch the trend over a season — seeing your consumption drop is genuinely motivating, and it will drop.

If you want to accelerate the process, this is exactly what a bit of coaching fixes fastest. A good instructor can spot in five minutes what might take you fifty dives to notice about your trim or your kick. Come talk to us about a refresher or a buoyancy-focused session — it’s some of the best money a newer diver can spend, and it pays you back on every dive after.

You’re not doomed to be the first one up. You’re just early in the skill. Keep diving, chip away at these, and before long you’ll be the annoyingly relaxed one with half a tank to spare.