Check this out, there's some hilarious clips on this! Keep watching around 2:50 too, a player does a flip before a throw-in and I was wondering whether that was allowed? [video=youtube;Mpo8ZpRR1G0]http://www.youtube.com/watch?v=Mpo8ZpRR1G0&feature=watch-vrec[/video]
Providing both heels are on the ground when the throw is taken you can do pretty much whatever you want in the run up. You can take a quick throw while sat down as well so long as your heels are on the floor.