Why keep a training log and or schedule?

A lot of people wonder why they have problems showing progress when they train. The problem is that they are just simply going at the gym in some sort of random non calculated guess. I don't know about you but if I went about my regular work schedule in a random miscalculated way. I would probably not have a job right now or that long ever in my life.  When you go on vacation do you just go and wander around some foreign place hoping to see something neat? No. Of course not you plan and schedule what you are going to do and it should be the same in the gym. Not only will a training log or schedule keep you on pace with your routine but it also allows you to plan ahead. Lets say you did some heavy lifting and you are still feeling it than you can schedule in a light day for that body part or even change the exercises in advance. No guess work just results. Every person that is successful in the gym always runs a training schedule and logs their progress. Some of these people have been doing this for so long that they can simply do this in their head. But I guarantee they are also writing it down somewhere and tracking their progress. So what are you waiting for? Go get your log and start tracking your progress so you can join the rest of us.