In reply to Roadrunner6:
It's true, and certainly an issue amongst some runners, mainly female.
I spend a lot of lockdown on YouTube (!), & saw an amazing german 10000m record on the track in the USA recently by Konstanza Klosterhalfen (sp?), but if you look it up... well my overriding feeling was, oh no. She is an amazing distance runner, though, no question. ....