What to write in a training log so it actually helps

What actually belongs in a training log, what to leave out, and how a fifteen-minute read once a month tells you which single thing to change next.

Most training logs die in week three, and rarely because someone got lazy. They die because people write down everything and use none of it. A log earns its place only if it tells you, standing over the bar, what you lifted last time and whether you had anything left in the tank.

What a log has to answer

A good entry answers three questions in ten seconds: what did I do last time, what did it cost me, and what am I doing today. If you have to scroll for a minute to find that, the log is too complicated to survive.

The difference shows up in a single line. Did legs, felt hard is worthless a fortnight later. Squat 80 kg — 8/8/6, last set to the wall tells you immediately that today you load 80 kg and chase three sets of eight, or move to 82.5 kg if the first set flew up.

The five things worth recording

For strength work, five items per exercise are enough, and they all fit on one line:

Date and which session it is in the week — this later explains why Thursday was flat.
Exercise and load in kilos, bar included.
Reps per set, written separately: 8/8/6, not 3x8. A drop from eight to six is information; an average deletes it.
What you had left — reps in reserve. Two more in you, write 2. Stuck halfway, write 0.
One word on quality: clean, back rounded, smoother than last week.

For running or cycling the content changes, not the principle: distance, time, pace per section, and how hard it felt on a 1–10 scale. That effort rating is often more useful than heart rate, because heart rate jumps around with coffee, heat and a bad night's sleep.

Only log rest periods when they are part of the plan. If you are doing heavy triples, three minutes and ninety seconds are not the same session, so the number belongs in the book.

One line of context

A single line per session, ten words at most, beats any app feature. Five hours' sleep, third session in three days, skipped lunch explains exactly why 80 kg gave you six reps instead of eight.

Without it you will read a normal bad day as decline and start rewriting a programme that was working fine. This is also where head tiredness and body tiredness get mixed up, and they call for opposite responses — there is more on telling mental fatigue from physical fatigue in a separate piece.

Breaks deserve the same treatment. If you missed a week, write one sentence rather than leaving a hole in the log; what actually happens after a week off is far less dramatic than most people fear, but you can only see that if the gap is labelled.

What to leave out

Logs collapse under excess. A few things almost never pay their way: heart rate for every set if you are not running, percentages of a one-rep max you have never tested, and a fresh bodyweight number every single morning.

For weight, step on the scales three or four times a week and read only the weekly average. A kilo swing overnight is water, salt and food in transit, not fat. If the numbers start pulling you towards obsession, it is worth reading how to track progress without letting it take over and cutting yourself down to one measure.

Weekly photos are usually clutter too. Once every four weeks, same light, same time of day, is enough to catch a change that is genuinely there.

Reading the log once a month

Writing without reading is wasted time. Give it fifteen minutes a month and look for four things.

How many sessions you actually did against the plan — 9 out of 12 is a different story from 4 out of 12.
Whether the load or the reps moved on two or three main lifts.
Which exercise you keep skipping or shoving to the end.
Where your reps in reserve have sat unchanged for weeks.

A workable rule: if a lift has gone six to eight weeks without moving in kilos or reps, change one variable — sets, tempo, or the variation you use — not the whole programme. If the sticking point is on the scales while the gym work is progressing, the causes are usually elsewhere, and they are covered in the piece on weight-loss plateaus.

A log is also the cleanest test of whether your goals are realistic. Once you translate them into numbers you can write down, it becomes obvious which parts are a plan and which are a wish, which is the whole point of setting goals that actually work.

When to see a doctor

Give pain its own line: where it is, when it shows up, and how strong it is from 1 to 10. Those three details separate ordinary muscle soreness — arrives within a day or two, fades within three — from something that keeps coming back.

See a doctor if the same pain returns in the same spot for more than two to three weeks, if it wakes you at night, if it comes with numbness, weakness or swelling, or if effort brings chest pain, faintness or breathlessness out of proportion to the work. Here the log has real practical value: you arrive with dates and loads instead of saying it has hurt for a while.

The short version

Record load, reps per set, and reps left in reserve — those three numbers drive the next session.
Add one line of context (sleep, meals, which session of the week) so a bad day does not read as decline.
Drop the clutter: daily scale readings taken one at a time, untested max percentages, per-set heart rate.
Read the log for fifteen minutes a month and change one variable when six to eight weeks show no movement.
Pain gets its own line; if the same pain returns for three weeks or wakes you at night, take the dates to a doctor.