At work right now I'm digitizing some old contour maps (read: tracing using a computer), a process that involves clicking on the mouse a whole lot. For example, one medium sized line is roughly 1000 clicks, and on this one map there are probably a couple hundred contour lines... and then there are about 9 map sections that will need to be done. You do the math.
But I got to thinking, and realized that all this clicking is just too darn easy--you don't burn any calories or build up any muscle tone. What someone needs to do is make a mouse that has a 10-pound button, that way, every time you click you're doing a rep--soon you'll have the beefiest index finger out of all your friends! You can call it the EXRMOUSE! Just think of the commercials--a mouse beating up a cat, or some skinny guy doing pushups using only one index finger!
Should I apply for a patent? What do you think? Sure to be a best seller, eh?