While using the freestyle technique of swimming, what is the proper way to breathe? Is using the nose to breathe out while under better or is there any difference? Is there a specific number of 'strokes' that should be done before taking a breath? I've been told to alternate your breathing sides, and to always make them opposite of the arm raised out of the water, is this correct?
I stumbled onto a great resource of swimming information: Swimsmooth.com that happened to have a couple of great tips I'd like to share:
The reason you want to breathe is not because you have a lack of oxygen. You only consume a couple percent of the 20% oxygen you breathe in, no the reason you breathe is to get rid of the CO2! So focus on exhaling as fast or powerfully as possible. With focus, I mean practice it regularly while swimming more slowly and really try to get rid of all the breath in your lungs as fast as possible. When you've exhaled, you're able to inhale again, so mastering exhaling gives you more flexibility in when you decide to inhale again (you never have to wait).
2. When you're not breathing, keep your head still.
Your head is like the steering wheel of your entire body, so keeping your face still, looking down means your body will have a steady posture too. If the swimming pool has lines on the bottom, it greatly helps to swim straight above, because it gives you a point of focus.
3. Breathe "in your armpit".
As Swim Smooth puts it:
Try to limit unnecessary movement, so simply rotate your head by moving your chin towards your armpit. Normally the trough created by your head should be large enough to allow your mouth to be just above the water, so you can breathe in.
4. Don't lift your head.
If you listened to my previous tip, you already knew you not supposed to lift your head, but simply rotate it. One important reason you don't want to lift your head is because it's very straineous on the back/neck muscles, but more importantly it causes your legs to sink lower! This slows you down and makes the swimming heavier, thus increases your need for air...
5. Don't over rotate your head.
A picture says more than a 1000 words, so here's another great example from Swim Smooth:
If you rotate your head too far, remember your entire body is rotating with. This is bad for several reasons: your leg might be kicking near the surface of the water rendering it pretty much useless; your arm dives too deeply, making it heavier to lift out of the water again and your increasing your frontal surface within the water, which is also very bad!
6. A lack of body rotating hurts your breathing
The first reason for this one is obvious: if you rotate your body, you don't have to rotate your neck as much to be able to breathe. But there's more, so much actually that Swim Smooth has a whole article about it that I highly recommend! Other than because you need it for a good technique, I think there's one important point:
Those muscles are much more effective if you rotate slightly, because when lying face down, it means more strength would have to come from your breast muscles instead of the very strong back muscles. It also means you have to lift your arm higher out of the water when swinging it back forwards. But just as with over rotating your head, also don't over rotate your torso! Instead, read the article to see what you should be doing!
This helps you create a symmetrical swimming technique, prevents over-using one side, gives you more flexibility to breath when you need to and it forces you to keep up a decent stroke frequency. The bilateral breathing forces you to rotate slightly from side to side (see previous point) and because you breathe every three strokes, if you make too long strokes you'll start to run out of air. That's how it forces you to optimize the length and speed of your strokes to find a ratio that fits you best.
So how much should you be breathing?
That depends on how fast your swimming and how much oxygen you need. When sprinting you could be breathing at nearly every stroke, because you're in dire need of oxygen. But when you're swimming longer distances, your probably breathing every three strokes. This makes a great habit, because of the bilateral breathing, but also because it helps you find a good rhythm. If you can make 5 strokes before needing to breath, you're probably not swimming fast enough for a decent workout. If you need less than 3 strokes, you're probably swimming too fast or not breathing out enough (thus leaving some CO2 behind in your lungs!).
Exhaling should definitely be done while the face is submerged underwater, by doing this you are decreasing the amount of time that the face needs to be out of the water. When the face is out of the water it causes disruption to the streamlined position of the stroke and increases water resistance and drag, this decreases you're momentum. It also reduces your balance meaning you have to work harder. As well the longer your face is out of the water the more disruption to the rhythm of your stroke there is.
Breathing rate is completely dependent on what the individual finds comfortable. However, i do not agree with the earlier suggested patterns. Sprinters do not need to breathe as much. Sprinters rely on their anaerobic energy systems, meaning they do not require oxygen! Breathing, even when done so correctly disrupts the rhythm and momentum of the stroke. Sprinters rely solely on speed! They cannot afford too much disruption to their stroke of rhythm. If 25m can be swam without breathing then it should be done so, same with 50m, although unless at absolute elite level this is difficult. A pattern can be developed such as breathing every three strokes but since it is a sprint race something like every 7 stroke would be better suited. Alternatively, breathing every three or similar on the first 25m and then as little as possible on the second 25m is also ideal. 100m is still classed as a print race, but again presuming this is not a question for elitist athletes then breathing patterns should be similar to every three or five as with all classed middle distances.
As distance increases, so does the variation in breathing patterns. However we do normally see an increase in the breathing rate, this is so more oxygen can be consumed to prolong the onset of fatigue. I can go on about how each energy system works but the energy system which requires oxygen is the only one which does not cause fatigue, due to it not causing lactic acid. It is true that we still get fatigued when using the aerobic (oxygen) energy system but that is when our demand for energy becomes too much for this system to handle as we can not consume enough oxygen to cope with the demand and we begin to use the energy systems which do not require oxygen which produce fatiguing by-products- lactic acid.Quite often with very long distances such as 800m and 1500m, many elitist performers breathe every other stroke for the majority of the race but then reduce their breathing rate as they enter the final, sprint stages of the race. Breathing can also become tactical, such as Ian Thorpe who breathes out of only one side, not arm. This enables him to keep an eye on who he considers to be his main competitor throughout the whole race. Breathing bilaterally does produce a more rounded stroke in some respects but there are also some benefits to breathing to one side, it all depends on the performer as to how often as well as how they breathe. But these are the most typical examples of breathing rate.
Last piece of advise: find your own, natural pace! Best practices go a long way, but you also have to feel comfortable with them. Also, try to spend some time every week focusing on improving your technique, rather than your condition, because you'll need to make further improvements in the future.
Mouth vs nose
Some exhale through the nose, some through the mouth and some through both at the same time. Both is somewhat better (it's faster, deeper and prevents water coming in) but maybe needs more practice to be done properly.
Anything from 1:1 to 5:1 is very common but 3:1 is considered the most efficient* (3:1 is 3 strokes for 1 breath). When you use even strokes (2:1, 4:1 etc) it is very difficult to keep a straight path but other than that (as far is I know) it is a matter of style and personal preference.
*I think olympic freestylers use 2:1 though
Always breath to the side of the arm that is out of the water.
edit: I'm not sure if you are asking that but you should DEFINITELY breath out while under water; usually straight down.