Because gyms are now closed I go running outside and I have noticed that nearly all runners use wired earphones/earbuds. It is obvious that these are dedicated runners and wondered if the reason is that bluetooth or wireless earphones are flaky when running. I assume it is not cost as some wear what look like designer outfits and sunglasses (when we get sun in England). This is not an important question of course, I’m just curious - especially as I have never tried bluetooth earphones or headphones.