Simple ones work just as well.
Sure it would be great to have extra padding so your feet don’t hurt as much,
And aerodynamic designs that make you feel like you are glidng rather than running would be nice-
But running barefoot on the sand works too.
It would be amazing if your shoes were custom made,
But store bought ones will do just fine.
The one thing the store can’t sell you
Is about the only real thing you need to be a runner:
The will to get out of bed and run.
Everything else is extra.