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...between the body and the mind. On the one hand, it is through measurement of performance that we observe progress. On the other, it is imperative that you use the intangibles related to how you feel to ensure your fitness program is working for you, and not vice-versa. It is entirely possible to be 'on your game', performance-wise while dragging your body through the ringer to get there. This is not the path to long-term improvement.
CrossFit has done a great job of defining the rather nebulous concept of fitness as increased work capacity across broad time and modal domains. But let's not forget that nature does not mold itself to anyone's definition of anything...these definitions are merely markers used to create a common language for discussion of a concept. That said, fitness is still a nebulous thing, tough to pin down, and the numbers associated with performance are not often the only markers that matter.
Let's look at the largest time-domain there is, your life. Across this time-domain, you will experience an undeniable ebb and flow of performance, interest and ability. This will translate into periods of less-than stellar performance, followed by periods of kicking ass, and all points in between, assuming you are interested in a long-term active lifestyle.
In many of these times, the arbitrary numbers associated with working out may not be the best and only means to evaluate progress. Emotional state, mental clarity, and overall sense of wellness must not be discounted at any of these times. Kicking ass, but feeling like crap is no good and definitely not sustainable long-term. While the definition of fitness above is very complete, it is easy to get lost in the math-game. Doing so is a great way to ensure you do not increase your work capacity across the broadest of time domains...burnout does nothing for increasing anyone's work capacity, in any domain.
So, continue kicking ass, setting PRs and upping your game. Just make sure you take the time to check in and make sure those little things like enjoyment, sense of well-being and accomplishment are still part of the equation. Your fitness should be working for you! Make sure you're the one wearing the pants in this relationship.
Have Fun,
-Boz