Bouncing

We bought the exercise ball with the intent to help improve our core muscles, it's definitely helping us workout - but not quite in the way we imagined.  We discovered that William loves to bounce along to a good song. He has plenty of stamina and can go for four or five (or more) songs in a row. Which is great for him, but gives us a good workout, whether it be holding the ball still and steady, or holding/bouncing/lifting William along to the music. I've tried doing it with him sitting on the ball (for a little more safety) it doesn't last long as he definitely prefers to be standing, and his sturdy little legs work with the bounce, making it slightly easier on us too. It often feels like he's adding his own energy to it, and you can tell he wants to keep going if you stop by the waving of his little arms. How can we say no to that cute face? :)