Why are athletics uniforms so skimpy?

They are like this because it makes it easier for the body to move. If you try doing the splits in jeans your not gonna get very far. If you try it in shorts you will get farther. The less they wear the more the body can bend. I am a Cheer leader, a gymnast, and i run track. I do do embarred with what I have to wear because I do not like to show my body. But they probably do not care because they are getting paid. Really no one knows if they will get worse or not with things kids think are ok today they will probably start wearing nothing lol.