As I always move fast I have a problem with feeling like I loosely strapped a brick onto myself when I put my phone in my pockets, including waist and knee ones. It chaotically moves at each step and I'm tired of that. To the point I take it in my hand when I'm in a real hurry.

I guess, Lemmy has a lot of people who either run or do outdoors activities and labor.

What are the best positions on the body to make it move less when you walk or run? Are there some great smartphone holders, straps that you can recommend? Can I use it with casual clothes without it looking weird?

I suppose the ones you place on the belt are obvious to suggest first, but I haven't seen them since the death of small button phones and current smartphones are kinda big for that to work. And no, putting it into a bag, a suitcase or a backpack wouldn't work for me for I prefer not to be dependent on carrying them on me.