I would say all the elite use but most also do cardio. Contrary to popular belief cardio does very little for fat loss. The only way to really lose fat is diet, however you want to lift weights as well so you can maintain muscle mass which allows you to eat more food within reason and not get fat. Otherwise you will just be a skinny fat person who has to eat like a bird just to stay thin.
just food for me, my farts smell like roses