Exactly. There's no how-to guide there. It's mostly an ad. Good idea, though. Search for "How to Breathe"; there are some good sources. Especially important if you're on lockdown and moving less than usual.

Right, this seems like an interesting subject, but not a lot of information there. Can anyone suggest better sources?

Any comments on the following: https://news.ycombinator.com/item?id=22662071

It took a bizzare turn with the sentence beginning "Focus on the foot and ankle muscles..."

I couldn't find anything either. Didn't expect click bait from Penn State.