I've recently been wanting to get back in shape so this is perfect timing. My morning workout instantly got me up to Level 4 - great motivation.

One comment - I'm using a netbook (1024x800 resolution) and some of the boxes, like "great, you just earned X points" are too tall for my browser window, but they move when I scroll - I can't see a button to make the box go away, so I have to click on "play."