Why do stingrays jump out of the water?

Recently I was looking out over the Biscayne Bay towards Monument Island, daydreaming of when I’d be able to open water swim to it.

It looks like this…

In these waters, around the sailboats, I saw a giant stingray jump out of the water, multiple times. I’m used to seeing dolphins, manatees, and even sharks swimming through this path, but I have never seen a stringray…