> That common knowledge, nothing revolutionary here.

I've never read about that. So it's not "common knowledge" - except maybe in the running community.

I like your comment for putting some facts into place (how far you can go with common options). But as I never heard of this before, I have no idea how common it actually is and the effects and the science around it, what research does say to this, how and why this is used in other sports - or why not.