Why do gmynists put themselves in a bath tub full of ice and water?

I always see it in movies and I just wanted to know lolWhy do gmynists put themselves in a bath tub full of ice and water?
to reduce inflammed muscles from hard work outs and therefore to easy sore muscles and get them to relax... it's not exactly an easy thing to do to yourself... it's quite the shock to your body so i've never known anyone to actually DO that, however in movies it makes for a very dramatic scene... but it's logical because of how it helps and because gymnastics involves all muscles so it's easier than trying to put an ice pack on your whole body.Why do gmynists put themselves in a bath tub full of ice and water?
I'm not a gymnast but I have done it before to reduce soreness. It isn't that bad once you get in. It's like getting used to the cold water in a pool, or at the beach.
To reduce cramping and sore joints.