I switched my logo to a fitness tracking app. It is easy to track how many repetitions at what weights you do. It also can remember specific machines you do. On the app you can check your logged progress by machine, body part target, or overall progress. I wanted the boxiness of the squares and the gradient to move from the left to the right and be more colored to the right. Also the Journal page in front of the calendar is to emphasize that you can do more than just type in that you went to the gym. 

~Cassandra~