while I wait - What Chair exercises can you come up with?

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As I sit here waiting for my very slow dial-up connection (28.8 kbps on a good day) to load a page, I have been trying to do some exercises. The chair I sit in has a back that will go wayyyyy back...so I am doing modified crunches, going back and using my stomach muscles as I come back up, I can get quite a few in before the page finishes loading. Probably not the most effective exercise, but I am sure every little bit helps, no? what other exercises can you think of to be done while sitting at the desk?