9/10 runs I leave my phone at home, but when I do bring it for some reason, I'm very happy with my "Flipbelt(tm)". It carries a 250g phone with no slipping, sliding or bounce.

My Flipbelt has lost some tightness after three years and many laundry cycles, but it still manages a Pixel 10a with no problems.

The belt rests over the hip and I usually have the phone flat on my backside. I don't really notice it after a few steps.