I just did the first run of Week 5, and was interested to hear Laura's advice to breathe in through the nose, out through the mouth. I realise that up until now I've been breathing in and out both through my mouth. This has worked fine for me so far - I hadn't really thought about it, which I guess is a good thing. But I wondered if there might be a reason why it's preferable to inhale through the nose? If it's better, I guess I can retrain myself. If it's not important, I'd be glad to stick with what I've been doing as it feels natural. Any advice would be really welcome! Thanks.