I'm haven't been using the NHS C25K app because for some reason it wouldn't work. So I used another very similar app. But, it doesn't talk about how to breathe properly when running. So, I looked it up on the internet and discovered the 2-2, 3-3 etc method of breathing, explaining to breathe into your stomach and not your chest. It said that if you'd been breathing into your chest, you have probably been getting a stitch. So, since then, I have been trying very hard to use my stomach and guess what? I've been getting a stitch!
Has anyone got any advice on why? Am I doing it wrong? I find I'm spending a lot of time trying to concentrate on my breathing!