How to Log Your Strength Training So You Actually Get Stronger

A training log is what turns showing up into getting stronger. Here's what to record, how to read it, and what a good strength training app actually needs to do.

Plenty of people train hard for months and still bench the same weight they did last spring. The program is rarely the problem. The problem is that they can't remember what they did last time. A simple training log fixes that, and these days most of us keep it on our phones. But before you download a strength training app, it helps to know what the log is actually supposed to do for you. Otherwise the app just becomes another place where numbers pile up and nobody looks at them.

Why bother logging your lifts?

You get stronger by giving your body slightly more work over time. That's progressive overload, and it only works if you know your starting point. Without notes you're guessing, and most people guess wrong in one direction or the other: too cautious or too eager.

A log gives you three things:

• A target for today. You see what you managed last week and know exactly what to beat.
• Proof over time. When it feels like nothing is happening, you can scroll back three months and see that your squat really has gone up.
• Clues when something hurts. If a shoulder starts complaining, you can check which exercises and how much volume came before, instead of relying on memory.

If you want the theory behind adding weight, our guide to progressive overload goes into much more detail.

What to write down

You only need a handful of details per set. Everything else is a bonus.

The basics: exercise, weight, reps and sets

Name the exercise precisely enough to repeat it: "low-bar back squat" or "30-degree incline dumbbell press" tells you far more than "legs" or "chest". Record the weight in kg or lb, whichever your gym uses, and for dumbbells note the weight per hand. Lots of people write 3 × 8 at 60 kg, but it's better to log every set on its own. Sets are rarely identical.

Effort: RPE or RIR

Two sessions with the same numbers can feel completely different. That's why it pays to note how hard each set was. RPE is a scale where 10 means you couldn't have done a single extra rep. RIR, reps in reserve, counts how many reps you had left. RPE 8 works out to roughly two reps left. Pick one and stick with it; what matters is that you rate your sets the same way every time.

Rest between sets

Rest changes what you can lift. Five reps after three minutes isn't the same performance as five reps after one. You don't need to time it to the second, but if your rest periods are all over the place, write them down.

Quick notes

One line is enough: "slept badly", "new grip", "felt it in my lower back on the last set", "easy, go up next time". Those notes are often what explains a bad session after the fact.

How to read your log and know when to go up

A log is only useful if you check it before you load the bar. A simple, proven method is double progression: you work within a rep range and only add weight once you hit the top of that range on every set.

A bench press example

Say the plan is 3 sets of 6–8 reps.

Add effort ratings and the picture gets sharper. If every set at 60 kg landed around RPE 7, go up with confidence. If the last set was RPE 10 and your form started to wobble, give it another week.

Signs you've stalled

• Same weight and same reps for three or four sessions in a row, even though you're giving it everything.
• Your effort ratings keep climbing while the numbers stay flat.
• Notes about poor sleep, stress or soreness keep showing up.

That's your cue to look at recovery, switch rep ranges or take a lighter week before pushing on. The log won't hand you the answer, but it shows you where to look.

Notebook or app?

A notebook works. Plenty of strong people have trained that way for decades. The real question is which one you'll actually stick with.

Paper suits a simple program with a few lifts. An app earns its place as the number of exercises, sessions and weeks grows, and when you want to see progress without doing the maths yourself.

Checklist: what a good strength training app should do

Run through this list before you commit. It matters more than whatever features are splashed across the store listing.

1. Fast logging between sets. Entering a set should take a few seconds, ideally with last session's numbers already filled in so you only adjust.
2. Last session in plain sight. You should see what you did last time on that exercise without digging.
3. History and graphs. A chart of weight, volume or estimated max per exercise tells you at a glance whether you're progressing.
4. A large exercise library, plus custom exercises. You need to find what you do and be able to add what's missing.
5. Programs and templates. Ready-made programs help beginners, and building your own workouts matters more as you gain experience.
6. Fields for RPE or RIR, rest and notes. Without them, your log only tells half the story.
7. A rest timer. Ideally one that starts automatically when you log a set.
8. Data export. Years of training shouldn't be locked inside a single service. Make sure you can download your history as a file.
9. Works without signal. Plenty of gyms are in basements. The app should keep working when your phone loses its connection.

If you also run, do circuit training or prepare for races like HYROX, it's handy to keep everything in one log. TANK is one example of an app where strength, circuits, running and races are logged in the same place, and the training log itself is free.

Common logging mistakes

• Tracking everything except what matters. Calories, heart rate and mood are fine, but without weight and reps you can't plan your next session.
• Filling it in afterwards. An hour later you won't remember whether the third set was seven reps or eight. Log it on the spot.
• Chasing numbers at the expense of form. Adding weight by cutting your range of motion in half isn't progress. Leave a note about technique and keep the weight where it is.
• Never looking back. Spend a minute before your session checking what you did last time.

Technique is the hardest thing to capture in numbers. One option is to film a set every now and then and compare over time. In TANK you can film an exercise and get an AI score from 0 to 100 with tips for each rep, a premium feature that can complement the numbers in your log.

Start with your next session

You don't need a perfect system on day one. Start with exercise, weight, reps and sets. Add RPE or RIR once it feels natural, and write one line about how the session went. After four weeks you'll have enough data to spot patterns, and it becomes obvious when it's time to add weight.

What makes the difference isn't the tool you pick. It's logging every session and actually reading what you wrote.