I haven't kept track of my workouts regularly for several years, and I normally do fine. I've just been in a rut lately, so I think tracking the numbers will help me and force me to push myself a little more. I don't plan to do it forever, just a little while to get me going again.
I started a new job 2 months ago, and it's been hard adjusting to the new schedule. I just need a little focus.