Whether you are a new or experienced runner, it is normal to breathe harder than usual. However, breathlessness and discomfort should not be part of running.
When running, breathe in and out through your mouth, breathing deep from your diaphragm and not your chest. This will allow you to take in more air. You should be running at a pace at which you can breathe easy, where you can still speak in full sentences. The more fit you become, breathing will be easier.
If you do feel you’re running out of breath; relax, slow down or walk and your breathing should resume as normal.
If you find that you are wheezing and have trouble catching your breath, even when you do slow down, speak to your doctor about whether you might have asthma.