What is the difference between swiss balls and medicine balls?

Susan from the Workin’ on My Fitness site recently wrote about doing some ab work in order to get over some work-related stress. I asked her whether she had ever tried using a swiss ball rather than using a machine or just a mat. She emailed me back with the following question:
I’ve never used a swiss ball, although I’ve used those balls that are weighted. Is there a difference? I’m down to trying anything new when it comes to ab work.
It turns out that she does in fact have a swiss ball, she just had not heard the terms that I refer to them as before. Below I have provided a brief description of medicine balls and swiss balls, as well as their ugly step-brother the bosu ball.
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