People in general need to exercise more. Motivation is a key factor. There are plenty of products to exercise with, there are videos and classes and trainers to motivate you once you've started exercising, but what is there to get you to leave the couch and start to work out?
The Sedimentometer is the opposite of the pedometer. Instead of tracking the steps you take, it tracks how long during your day you are not moving, and beeps and certain intervals to remind you to take a break and move around.
TECHNOLOGY: Pretty simple, cheap to produce in China.
MARKET: Fair, but not huge.
FINAL THOUGHTS: Best to license this idea to a company that makes fitness equipment.