I've kept a small spiral notebook in my gym bag for a few months now, and I've realized I write down the same three things every single time: the movement, the weight, the reps. Rest time? Never. How I felt that day? Never. Cardio gets a checkmark and nothing else.
Yesterday I flipped back through it trying to figure out whether the squats that felt awful were the heavy ones or the ones after a rough night's sleep, and I genuinely couldn't tell. So the log is only half doing its job.
The other half is honest at least — 40 minutes, three times a week, whatever my schedule allows, no fancy programming. Do you all write down more than sets and reps? Energy, sleep, how the bar moved? Wondering if extra detail actually changed anything for you or just turned into one more thing to keep up with.