If anyone’s interested in making things that detect physical activity, you should check out Wockets, an open-source effort directed by MIT. They’re trying to make cheap, easy-to-use motion sensors that can be worn and interfaced with cellphones.
http://web.mit.edu/wockets/index.html

They’re particularly looking for people to help develop new hardware and packaging. If you’re so inclined, the wiki can be found here: http://wockets.wikispaces.com/
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