I’ve long been a proponent of working out barefoot or in shoes with little padding. Yeah, I know this goes against conventional wisdom. I’m not saying I know what I’m talking about, I’m just saying: look at all the fancy pantsy $150 sneakers and orthotics we have. Look at all the knee and foot problems. Ok? Ok.
Here’s an article about flat feet and some exercises to improve your foot mobility and strength. I’m doing it right now and it’s kind of fun! Check it out, let me know if you try it and how it works for you.