i see something fun in your future;-)

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Link to my photography
http://davidsavoiephotography.blogspot.com/
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I am guessing it is over now, as it doesn't look like he is riding any more. do you know what kind of rollers he was riding? I have cranked out multiple 5hr rides on my emotion rollers but, 7hrs on regular rollers while teaching is a bit more of a challenge! I wonder if he took any pee breaks or just went on the floor in between classes??

Wow, talk about multitasking. I also teach high school physics and I am tempted, although, like some of the other responders, I wonder how he overcame the friction/heat issue.

Great Job! That's why physics teachers rock!