I'm compulsive. For weights workouts I have hard copies of worksheets I've found online: from other VFers, Beachbody, the Measured Mom's Cathe Compendium and some of my own. All are Word or WordPerfect charts or Excel adaptations. I write down the date and weights used for each exercise in a workout. I have my own abbreviations: "up" arrow means increase weights next time, a circled "T" means the weight selected was do-able but tough, "F" means I hit failure, I draw a
when I go up in weights, etc. I also scrawl notes to myself in the margins, like "try BB [barbell instead of dumbbells] next time", "sub KB [kickbacks] for dips". My problem is keeping up with my worksheets: most have space for me to do the workout 3-4 times before I have to reprint, but often I'm too lazy, so I start recording a workout on the back, in the margins, on a sheet of notepaper, whatever's handy. I also have an accordion file to organize my worksheets and that's a mess right now. One of my tasks for this week is to get it sorted!
There definitely is a start-up time commitment to gather online worksheets or to create up your own template. If you think it will drive you crazy, it's not worth it. A large Post-It attached to the DVD case with the date you did the workout and "used 5 and 8# dumbbells" might be all the information you want to keep. For workouts like my Classic Firms, that's all I do. But I'm on a strength-building binge this year so my crazy-detailed worksheets for focused strength workouts are invaluable for me to gauge my progress. They also make me more efficient, since I'm not standing there wondering which dumbbells I need for the next exercise. In Body Beast, Sagi is always admonishing his backgrounders, "write it down. Write it down. WRITE IT DOWN" and that's my mantra too.