The Best Breathing Pattern In The 100 Freestyle

Courtesy of Gary Hall Sr., 10-time World Record Holder, 3-time Olympian, 1976 Olympic Games US Flagbearer and The Race Club co-founder.

Aerobic vs. Anaerobic

The human body is equipped with two systems to produce energy for fast swimming, aerobic (requires oxygen) and anaerobic(no oxygen required). Both are used in tandem to produce ATP, the fuel for our muscles, but there are significant differences between the two energy systems that you should consider when choosing a breathing pattern for a specific race.

While the purpose of this article is not to describe these different energy systems in detail and how they work, it is to try to come up with the best possible breathing solution for the 100 freestyle. The reason that the breathing pattern in the 100 freestyle (and butterfly) is more controversial than for other distances is that for events shorter than 100 meters, the energy is predominantly derived from the anaerobic system. In events longer than 100 meters, the energy is predominantly derived from the aerobic system. In the 100 meters, the energy derivation is about half aerobic and half anaerobic.

Different Strategies

We know that the fastest way to swim freestyle (or fly) for a short distance is without breathing. The motion required to take a breath in free or fly increases frontal drag and can slow the stroke rate, both of which will slow the swimmer’s speed. Therefore, in the 50 sprints, where most of the energy is coming from the anaerobic system, a swimmer should breathe as little as possible. In the 200 events and up, where the energy is mostly from the aerobic system, a swimmer should breathe as close to the physiologically ideal rate as possible. That rate, as determined by what athletes do on land during sustained exercise, when oxygen is available at will, is typically between 40 to 50 breaths per minute. That means a breath should be taken every cycle (two freestyle strokes), in order to keep close to that rate.

What about the 100 freestyle, where the energy is split equally between the two systems, the first 50 being mostly anaerobic and the second 50 mostly aerobic? What is the ideal breathing pattern?

For two primary reasons, we believe the breathing pattern should be (and is) different for elite males and females. Women typically train more aerobically than men for the 100 freestyle (have better aerobic systems). Men typically have larger muscle mass than women, which can produce more lactate, lowering the body’s pH sooner than in women.

Studying the Elite

Virtually all of the elite male freestylers breathe every cycle in the 100 free (SC or LC), while most elite women will breathe on the first 50 with a 1:3 pattern (one breath per 3 strokes, breathing to both sides), a 1:4 pattern (one breath every 4th stroke to the same side). Simone Manuel breathes 1:4 for one cycle, then 1:2 for the next cycle, which is equivalent to the respiratory rate of the 1:3 pattern. On the second 50, most women will increase their respiratory rate by taking extra breaths. Both male and female swimmers typically hold their breath for the final 5-8 strokes, increasing the stroke rate to the wall. Some elite swimmers, like Caeleb Dressel, do not breathe on the final stroke into each turn, in order to accelerate into the wall.

When one looks at respiratory rates, Caeleb and Nathan Adrian will swim the 100 meters LC with a rate of about 35-38 breaths per minute, though Caeleb’s stroke rate is about 10 strokes per minute faster than Nathan’s.  Caeleb’s respiratory rate in the 100 yards is 30 breaths per minute, because more time is spent under water with the extra turns. His stroke rate in SC (125) is even faster than in LC (115). The elite women tend to hold around a 30 respiratory rate in long course, yet Cate Campbell, who has a slower stroke rate (around 92) and holds a 1:4 breathing pattern for the entire 100 LC, has a respiratory rate of 23…which is probably not high enough to prevent the pH drop.

The Best Breathing Pattern for You

What we like to teach at the Race Club for swimmers that do not have the aerobic systems of the elite athletes is to swim the first 50 more anaerobically with a 1:4 or 1:3 breathing pattern and the second 50 more aerobically with a 1:2 pattern. When the aerobic system improves with age and training, the respiratory rate can decrease. However, it should not go below 30 breaths per minute for women and in LC, 35 breaths per minute for men.

The 100 freestyle is not a sprint and requires a steady flow of oxygen intake, more so on the second 50 than the first, in order to maximize the performance. Have your breathing pattern determined and planned before the race, not during it. Otherwise, one will hold the breath too long at the beginning, when there is no feeling that breathing is needed, and will not be able to get enough oxygen at the end, when the pH drops too low.

Yours in swimming,

Gary Sr.

Gary Hall, Sr., Technical Director and Head Coach of The Race Club (courtesy of TRC)
[email protected]<http://[email protected] <


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3 years ago

Don’t you swim faster when you don’t breath so wouldn’t you have a better second 50 if you didn’t breath

Karim Mansour
3 years ago

Thanks a lot for your appreciated tips, would you mind to tell me about breathing patterns in 200 Fly for Girls below 15 years old

3 years ago


5 years ago

The 100 freestyle is a sprint!!!!!

The Grand inquisitor
5 years ago

One factor not mentioned in comparing breathing patterns and stroke rates is the overall duration of effort required to complete the distance. For example, elite women need to breathe (and train) slightly more aerobically than their male counterparts because they are swimming about 10% longer for the same event (in terms of duration, obviously not distance). Correspondingly, as people continue to get faster, their training for the 100 can and should become relatively more anaerobic. This is also a major reason why the 100 lcm is a much more aerobic race for the same swimmer than 100 scy – the total duration of the effort is generally more than 12% longer.

Reply to  The Grand inquisitor
5 years ago

Yes, the duration of the event does matter. Caeleb’s respiratory rate in SC yards is less than LC meters partly because he is swimming for 7 less seconds.

5 years ago

Jodie Henry would be the exception!

Billy Howard
5 years ago

I’d like to see someone address the finishing portion. Dressel goes at least 15 meters if not more (LC) not breathing, and I think part of that is because it takes time for oxygen taken in to actually reach the muscles, so breathing the last portion only has detrimental effect on speed without any positive effect on the race. However, to do that, you need to not already be in terrible oxygen debt prior to that closing burst, so keeping an even breathing pattern throughout might be the most beneficial.

Reply to  Billy Howard
5 years ago

Nearly every elite freestyler will finish a 100 holding the breath on the last several (5-8) strokes. They also increase the stroke rate and some, like Nathan Adrian, change technique by going to a straight arm (high octane) freestyle. Penny Oleksiak and Simone Manuel both held the breath for the final 7-8 strokes in Rio to tie for the gold. Some butterflyers (Tom Shields, Chad LeClos) will do the same for fewer strokes in the 100 fly.

5 years ago

I would reverse it…more breathing in first 50 than second so that it is easier to more evenly split the race.

Reply to  anonymous
5 years ago

Agreed. Getting oxygen at the beginning of the race to oxygenate your muscles, and then reducing the number of breaths the second half of the race…
Finishing with your head down at least 10m out alone reduces the number of breaths taken on the second 50.
I’ve found a 4-2-2 breathing pattern the first 50 and then a 4-4-2 breathing pattern on the second 50 to be really effective in freestyle. Taking less breaths allows you to better focus on tempo and head position.

Reply to  anonymous
5 years ago

Since the aerobic system takes 20-25 seconds to kick in, not sure it makes sense to breathe more in the first 50. Once that system gets going, it needs all of the oxygen it can get, so breathing a lot in the second 50 is essential.

Al Dodson
Reply to  anonymous
4 years ago

I totally agree with “ANONYMOUS” and “SWIMCLH” and disagree with Gary’s comment below.