Most athletes I'm aware of allow their heels to touch the ground. Unless you are aware of a bunch of athletes that walk around like velociraptors, and if you are, please share!
here's a stock photo of a runner:
https://images.stockcake.com/public/7/1/2/7124d219-0531-40c1...
and here's one of volleyball:
https://www.games-eshop.com/wp-content/uploads/2020/07/web.s...
We're not talking about how to use the body when performing in their sport/art, but how they hold their bodies at all times.