I am curious to see how those on here with bodybuilding goals track their progress?

It is obviously quite easy to track powerlifting or strength progress - you either lift a weight or you do not. For bodybuilding it can be a bit more complicated since some people look to build lean mass, some focus on body composition, and others focus on specific bodyparts.

Personally I have never taken regular bodypart measurements and have usually just gone by how I look in the mirror, but I know that can be deceptive at times.

So, what does everyone use? Tape measure? Calipers? Scale? Mirror?