Inertia is the resistance of any physical object to a change in its state of motion or rest, or the tendency of an object to resist any change in its motion.
For me, this also describes my tendencies toward side projects like my Pingus project. When I last worked on Pingus a couple of months ago, I updated the underlying AndEngine libraries and found a ton of breaking changes. I put Pingus on the shelf until I had more time to look at the breakage and how to solve it. The AndEngine changes are pretty significant and I’m going to need to rethink portions of Pingus in order to get things running correctly again.