People love statistics, especially about themselves. There's just something neat about being able to track linear progressions of our own ability. Well, hopefully it's a linear progression. There is a strong correlation between being physically fit and keeping meticulous records of your results. For one, people who analyze their workout routine with regularity are more prone to understanding why their particular exercise program is working, or vice versa. In direct contrast, people who workout with a plan and people who do not track their results in some sort of database or note-keeping-system, are far more likely to prematurely discontinue their routine, than people who keep a running journal. Just think about it; if person A records their progress and person B does not, person A is going to be a substantial favorite over B, in terms of which person is expected to religiously adhere to their training regimen. Diligent record keeping will help you analyze your entire workout routine and find leaks that you may have. Leaks are small holes in your strategy or tactics that are slowing down your progression levels. For instance, after you build up a sample size of a few months worth of workouts, you may notice that you have or have not been achieving the goals you set out to. If you had set a goal of doing X amount of reps on the squat rack with Y amount of weight, ideally you should be writing (typing on Excel obviously) your daily results. You can always try and just keep mental records, but once you try and keep track of all of your exercise patterns through relying on memory alone, your results will become disorganized and it will be much more difficult for you to decipher precisely what level you are performing at. Keep a journal. Try and do more reps. Lift more weight. Run faster. You can do these things by being results oriented and through careful analysis of your training program. Just winging it is for the birds. Maintain a scientific approach towards your fitness training and your goals will be realized.