How to swim 500 yards without stopping

Five hundred yards is the classic American benchmark: twenty lengths, the standard test in a lot of swim programmes, and the distance an enormous number of adults are stuck just short of.

The good news is that the thing stopping you is almost certainly not fitness.

First, what the distance actually is

500 yards is 20 lengths of a 25-yard pool. In metres that is about 457 m, not 500.

Worth knowing for two reasons. If you are in a 25 m pool, 20 lengths is 500 m and is a meaningfully longer swim — around 9% further. And when you compare your time to something published internationally, you are comparing two different distances, which the time converter handles.

It is also why an American swimmer's first 500 m feels harder than their 500 yards did. Nothing regressed; the pool changed.

Why you stop, and it is not your lungs

Three causes account for nearly everyone. In order of how often they are the real one:

The pace is far too fast. Adults default to a pace that would be appropriate for two lengths. It feels moderate for 50 yards and is unsustainable by 150. The stroke gets rushed, the breathing cannot keep up, and by length six you are stopping because you are in oxygen debt — not because you lack endurance.

You are not breathing enough. Many self-taught swimmers breathe every four strokes, or hold their breath and exhale explosively at the last moment. Neither moves enough air for a continuous swim. The fix is in how to breathe while swimming freestyle, and it is the single highest-value thing on this site for anyone stuck at three lengths.

Your legs are sinking. A body angled downwards through the water has a far larger cross-section than a flat one, and drag is the dominant cost in swimming. You are working hard because you are dragging a hull, and the cause is usually not the legs at all — see why your legs sink.

Notice that all three are technique. That is the pattern: the swimmer who cannot do 500 yards is rarely unfit, and is usually spending two or three times the energy per length that they need to.

The instruction that fixes most of it

Go slower and breathe more.

That is genuinely most of the article. Adults resist it because slowing down feels like conceding, and because a slow stroke feels less like exercise. But continuous swimming is an aerobic activity, and an aerobic pace is one you could hold for a long time — which by definition means it should feel easy at the start.

Breathe every two strokes if you need to. Bilateral breathing is a good skill and it is not a requirement for this; if breathing every three leaves you short of air, breathe every two and learn the other pattern later. The argument is laid out in bilateral breathing.

A concrete test for whether the pace is right: at the wall, you should be able to say a short sentence without gasping. If you cannot, you are swimming a sprint and calling it endurance.

Building it in pieces

Repeatedly attempting 500 and failing at 200 teaches you very little except that you cannot do 500. Break it instead.

Week one to two: 10 × 50 yards, 20 seconds rest. Total distance is already 500. The gaps are short enough that your heart rate barely recovers, which is the point — you are training the continuous system while keeping the technique intact.

Week three: 5 × 100 yards, 20 seconds rest. Same distance, half the number of breaks. Watch that your pace on the fifth is close to the first; if it collapses, you started too fast.

Week four: 3 × 150 plus 1 × 50, or 2 × 250, with 30 seconds rest.

Week five: attempt 500 continuous. By this point you have done the distance many times; you are only removing the last few walls.

If a step feels hard, repeat it for another week. Nothing here is a schedule you can fail. The weeks are a suggested order, not a deadline, and repeating a step is progress rather than a setback.

The general principles behind this progression, and how to keep extending it afterwards, are in how to build swim endurance. If the pool you swim in runs a pace clock and you would rather leave on a fixed send-off than count rest in your head, the interval calculator converts each of these steps into one.

What to think about while you are swimming it

Twenty lengths is long enough that your attention wanders, and where it wanders determines how the swim goes.

The unhelpful default is counting: eleven, twelve, nine more, this is awful. It focuses attention on how much is left, which makes the swim feel longer and does nothing for the stroke.

A better structure is to give each block of lengths one thing to attend to. Lengths 1–5: exhale. Long, steady, into the water, so you never arrive at the breath needing to blow out first. Lengths 6–10: the head. Eyes down, water at the crown, neck relaxed. Lengths 11–15: the catch. Feel the water on the forearm before pulling. Lengths 16–20: hold the pace. Nothing new, just do not let it fall apart.

This is not a mind trick. Attending to one element at a time is how motor skills consolidate, and a 500 done this way is a technique session rather than just distance covered.

It also solves the counting problem, because you are tracking blocks of five rather than individual lengths.

The two things that make it easier for free

Push off properly. Twenty lengths means nineteen walls. Even a modest push-off in a decent streamline covers several yards without a stroke, and over nineteen turns that is a meaningful fraction of the swim you did not have to swim. You do not need flip turns for this — an open turn with a good push works — but the mechanics are in how to do a flip turn if you want them.

Do not sprint the first two lengths. Almost everyone does. The first 50 feels effortless because you are fresh, you go far too fast, and you spend the rest of the swim paying for it. Deliberately make the first two lengths your slowest.

A useful trick: have someone time your first 100 and your fourth 100. If the first is much faster, that is the whole problem, and it is fixable in one session by simply starting slower.

If you keep failing at the same point

A pattern worth diagnosing: some swimmers stop at exactly the same place every time, and where that place is tells you what is wrong.

Stopping around length 4 to 6. Almost always the start was too fast. You are in oxygen debt from a sprint you did not know you were swimming. Fix: make the first 100 deliberately your slowest, timed.

Stopping around length 10 to 12. Usually breathing. The pattern was adequate while fresh and stops moving enough air once the demand rises. Fix: breathe more often, from the first length rather than when you start struggling.

Stopping in the last few lengths. This one genuinely is endurance, and it is the good problem to have — it means the pace and the breathing are broadly right and you simply need more aerobic work. Fix: keep doing the broken sets and the distance will arrive.

Stopping at a different place each time. Usually means the pace is inconsistent rather than too fast. A pace clock and honest splits will show it in one session.

After you can do it

Once 500 is comfortable, the interesting question changes from whether you can to how efficiently.

Start counting strokes per length on a fixed easy pace, and watch that number rather than only the time. Then set a training pace properly with two time trials, which is what CSS pace is for, and your sets stop being guesses.

And if the goal beyond this is a mile or an open water swim, the standards are in what counts as a good mile time and the safety realities in your first open water swim.

If the goal is a race instead, a sprint triathlon swim is 750 m — 820 yards, so barely further than the 500 you have just built — and the triathlon swim calculator turns a pool pace into an estimated split for it, alongside the wetsuit temperature limits and the swim cut-off each rulebook sets.

The rest of the sessions are in workouts.

This is general training information rather than a plan for your body. If you have a cardiac or respiratory history, talk to a doctor before pushing continuous swimming distances. Spotted an error? Tell us and we will correct it and date the change.