When I started tracking my walking metrics with Fitbit, I began walking faster and more frequently. I started running up and down flights of stairs and parking farther away from the office.
When I started tracking personal writing metrics, the same things happened. Because the numbers were in front of me, I worked to write faster than my last writing session and I had a greater desire to write the next day to meet my monthly goal.
Tracking personal writing metrics can make you a more prolific writer. More importantly, it can also make you more money, especially if you combine your personal metrics with other marketing metrics to get insights that other content marketers don't have.