I the date, bodyweight, hours of sleep, time, exercises, weight, reps, and sets. I also prefill out the weight and reps from the last time so I have clear cut goals to beat. It helps me catch plateaus. I also can never remember, other than may be weight used, how I performed last time. It is a great tool in my opinion. When I used to have the time I put it in an Excel worksheet and graphed the progress. The graph can be an eye opener.