It may seem easy to you, but do you remember your first time? This "fist on this fist and this is how we go up". There are many ways to put a fist on a fist.
My mama knows this song from when she was young. It was a tv show and a very naughty one: they said 'poopoo' on tv!! I can't imagine, but it was very daring back then. My mama says that they all got red cheeked by such naughtiness! It had nice music too: http://www.youtube.com/watch?v=iCs87Wru6ek. They are now repeating the show and that is how I know this song: