This is really good stuff taken from The Compound Effect by Darren Hardy.  

You may have heard about tracking before.  In fact, you've probably done your own version of this exercise.  But I also bet you aren't doing it now, right?  How do I know?  Because your life isn't working as successfully as you'd like.  You've gotten derailed.  Tracking is the way to get it back on track.

Do you know how the casinos make so much money in Vegas?  Because they track every table, every winner, every hour.  Why do Olympic trainers get paid top dollar?  Because they track every workout, every calorie, and every micronutrient for their athletes.  All winners are trackers.  Right now I want you to track your life with the same intention:  to bring your goals within sight.

Tracking is a simple exercise.  It works because it brings moment-to-moment awareness to the actions you take in the area of your life you want to improve.  You'll be surprised at what you will observe about your behavior.  You cannot manage or improve something until you measure it.  Likewise, you can't make the most of who you are-- your talents and resources and capabilities-- until you are aware of and accountable for your actions.  Every professional athlete and his or her coach track each performance down to the smallest minutiae.  Pitchers know their stats on every pitch in their repertoire.  Golfers have even more metrics on their swings.  Professional athletes know how to adjust their performances based on what they've tracked.  They pay attention to what they record and make changes accordingly, because they know when their stats improve they win more games and earn more endorsement deals.

At any given moment, I want you to know exactly how well you're doing.  I'm asking you to track yourself as if you're a valuable commodity.  Because you are.  Want that idiot-proof system we talked about earlier?  This is it.  So, regardless of whether you think you're aware of your habits or not (believe me, you're not!)  I'm asking you to start tracking.  Doing so will revolutionize your life, and ultimately, your lifestyle.