I'm great with number but I still keep a log so I can see my progress. For instance, when I'm doing periodization training, it is essential to make sure I increase weight every week. If I come in slightly slugish or something I might short myself because I'm mentally thinkg 275 is what I want on bench but in actuallity I did 285 last time. It makes me concetrate on progress and I psyche myself up and put on 290. Had I not referenced the log, I might have sold myself short.

But that's me. Some guys and gals can keep it upstairs, but my job requires way too much new data in and out everyday, so the log makes my life a little more structured.