I began running late last year just a couple of miles every morning. I've built it up to three now, but I still take it pretty slow.
A couple of weeks ago my beloved sports bra who's been with me for years finally gave up the ghost. I was heartbroken and lost. There's no way I could run without strapping myself in. Then I remembered a Christmas gift my sister gave me.
It's called a BooBuddy (
https://theboobuddy.com/) and I'll be damned if it doesn't work! It's basically just a big elastic band that fits over the top of my bra and acts as an extra pair of hands holding everything down!
I don't think it's a permanent replacement for my sports bra, but until I find the next perfect one it's not a bad alternative.