[spicybright]

I wouldn't trust this website. It's based around selling a fitness product, so there's a very good chance it's biased.

https://www.polar.com/en/grit-x

[hiptobecubic]

Both running and walking are fitness activities that are supported by their tracking hardware. In what way do you expect them to be biased?

[vnorilo]

Nah, seems like a content marketing piece, and frankly one of the better ones I've read recently.