Sorry, I typed a reply to this ages ago and must not have submitted.
I'm afraid the answer is really simple. I don't run 😂
Being of short stature, and autistic and anxious about times, I'm always embarrassingly early because even if I did run my legs are that short I wouldn't get any where fast.
Once a year I decide I will wear bras and I spend a fortune on different cuts, fits, strap sizes, material, bone/less, adjustable, and I just can't find a bra that does not meet all the criteria I have which is: must fit no spilling over, must not slip down my shoulders, must not cut into my back fat, must be supportive, must allow me to breathe, must not make my boobs too sweaty, must not stick to me or have too much friction when putting on, and mustn't mean I've to hold my breath at any point in the application process.
It's always all for nought. The closest I got was these stretchy sports bras from Asda but they didn't survive many washes before they stopped stretching and sagged and then spillage occurred regularly.