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How to log a workout so the data is worth something
Open almost any training log and you will find a wall of numbers that nobody has looked at since the day they were written. Exercise, sets, reps, weight, repeated for two hundred sessions. It looks like data. It is mostly bookkeeping.
The test of a log is simple: can you make next week's decision from it? If you cannot tell, three days later, whether 85×5 was comfortable or nearly fatal, the entry did not do its job.
The four things worth recording
1. What you actually did
Not what was planned — what happened. If the plan said 4×8 and you managed 8, 8, 7, 6, write 8/8/7/6. The drop-off across sets is one of the most useful signals in the whole log, and it disappears the moment you record “4×8” because it was close enough.
2. How hard the last set was
One number, every session: how many reps you had left in the tank. Two reps in reserve, one, zero. This single field separates “85 kg is my working weight” from “85 kg is currently my limit”, and those two lead to completely different plans for next week.
3. Anything that broke the pattern
Four hours of sleep. Trained at 07:00 instead of 19:00. Third session in three days. New shoes. A tweak in the left shoulder on the second set. These are the reasons a session was bad — and without them, a bad session looks like a plateau and gets treated like one.
4. The bar speed, in words
You do not need a velocity tracker. “Flew up”, “moved fine”, “ground out” is enough resolution to decide whether the next jump should be 2.5 kg or 0. Most lifters know exactly which of the three it was, and most never write it down.
A log without context is a receipt. A log with context is a coach.
What you can safely skip
Warm-up sets, unless something notable happened in them. Exact rest times, unless density is the variable you're currently pushing. Rating every set out of ten — the last one is the one that carries the information. Perfect completeness is what kills logging habits in week three; the goal is a log you will still be keeping in month nine.
Log during the session, not after
Memory for training is worse than anyone believes. By the time you're in the car, sets three and four have merged and the shoulder tweak has been edited out entirely. Everything useful in the list above is perishable — it survives about ninety seconds.
Which is why the interface matters more than the format. If logging a set takes more than a couple of taps, you will do it at the end from memory, and the log becomes fiction with good handwriting. This is the entire argument for voice: between sets you say “bench 85 for 5, third rep ground out, one left in the tank” and keep resting.
Gym Bro logs by voice. Speak the set the way you'd say it to a training partner and the coach turns it into a structured entry — exercise, sets, reps, weight, effort and how the session felt — then rewrites the rest of your program from it.
Start free trialReading your own log
Once a month, look back over four weeks and answer three questions:
- Did the working weight move? If not, was it stalled or interrupted — the “anything that broke the pattern” notes will tell you.
- Did the last-set effort drift up? Same weights getting harder is an early warning of accumulated fatigue and a signal that a deload is overdue.
- Which sessions did you skip, and were they always the same day? A day you consistently miss is a scheduling problem, not a discipline problem. Move it.
Those three questions are the whole reason to keep a log. Everything you record should make them easier to answer, and anything that doesn't is optional.