Did you ever think about maintaining an exercise journal? Keeping tabs of what exercises you are doing is the very key to your fitness success. How else will you know if what you're doing is working?
Maybe you are doing too many reps of one exercise and not enough of another. Keeping a workout journal will show what a great or not-so-great workout routine you're following. It will show that you are totally slacking off and you need to get back on that treadmill. Or it may reveal you're on ...