Be like Lance for only $7

I thought everything Lance Armstrong used would be worth megabucks but
evidently not. Also, if you have an iMac and can produce 1/7 of his
power output you can probably run the iMac on you bike (but you'd
probably have to balance the monitor on the handlebars).

http://www.wired.com/wired/archive/12.07/armstrong.html

DaveB