Your head unit captures everything. Power, heart rate, cadence, elevation, temperature, GPS coordinates accurate to the metre. TrainingPeaks turns it into charts. Strava turns it into a social feed. Between them you have more data per ride than a WorldTour team had per season twenty years ago.
And none of it tells you why.
Why Tuesday's threshold intervals felt like dragging a fridge up a hill and Thursday's felt like you could have gone another twenty minutes. Why you nailed a sportive on six hours of sleep but crumbled at a local crit after eight. Why the same 4x8 session at the same power produces completely different RPE readings a week apart.
The numbers record what happened. A training log records why it happened. That distinction is the difference between collecting data and actually using it.
Your Data Platform Is Not a Training Log
Here's the thing nobody tells you about TrainingPeaks, Strava, and every other platform you use: they are data storage and visualisation tools. That is their job. They do it well. But a training log is something different — it is the layer of human context that sits on top of the data and gives it meaning.
Joe Friel has been saying this for decades. The power file tells you the session happened. The training log tells you the story behind the session — what you ate, how you slept, what was going on at work, whether you had an argument before you left the house. When Friel reviews an athlete's week, the subjective notes are where he starts. Not the power curve. Not the TSS chart. The notes.
John Wakefield works with WorldTour riders at Bora-Hansgrohe. When he opens an athlete's file each morning, the first thing he reads is the wellness questionnaire — RPE, mood, sleep, muscle soreness, motivation. The power data is second. Always second. Because the power data tells you what happened to the body. The subjective data tells you what happened to the person.
If the best coaches in the world read the human notes before the numbers, that should tell you something about where the useful information actually lives.
What to Record: The Six Things That Matter
I am not going to give you a 47-field spreadsheet. Nobody fills those in. The trick is recording enough to spot patterns without creating so much friction that you stop doing it after a fortnight. Six things. That is all.
1. RPE — Rate of Perceived Exertion
A number from 1 to 10. How hard did the session feel relative to what you expected? Not how hard it was on paper. How hard it felt.
This is the single most underrated metric in amateur cycling. A session prescribed at 85% of FTP that felt like a 6 tells you something different from the same session at the same power that felt like a 9. If the power was identical but the RPE was wildly different, the explanation is not in the power file. It is in the context around the session — the sleep, the stress, the nutrition, the recovery from the day before.
Rate every session. Every one. It takes three seconds.
2. Sleep — Hours and Quality
Write down two things: how many hours you slept, and whether the sleep was good, average, or poor. Not a sleep score from your watch. Not a HRV reading. Your own honest assessment.
Over four to six weeks of doing this, you will see a pattern emerge so clearly it will annoy you for not spotting it sooner. The sessions where RPE is 2-3 points higher than expected almost always follow nights of poor or short sleep. The sessions where everything clicks — power feels easy, legs feel fresh, concentration holds — almost always follow really good sleep.
You already know sleep matters. But until you see the correlation written down in your own handwriting, week after week, it stays abstract. The log makes it concrete.
3. Mood and Motivation
One word or one sentence. "Flat." "Fired up." "Dreading this." "Could not wait to get on the bike." That is enough.
Mood tracks motivation, and motivation tracks adherence. If your log shows three weeks of declining mood scores coinciding with a block of high-intensity work, that is not mental weakness. That is probably accumulated fatigue manifesting as emotional flatness before it shows up in your power numbers. Mood drops precede performance drops by about a week. It is an early-warning system you carry around in your head, and most riders ignore it completely because nobody told them to write it down.
4. Life Stress
Here is where it gets really interesting. Life stress is the single most overlooked training variable in amateur cycling. And let me be really clear about this: your body does not distinguish between cortisol produced by a hard interval session and cortisol produced by a work deadline, a financial worry, or a family argument. The hormonal response is the same. The recovery cost is the same.
A rider doing five hard sessions a week with low life stress is in a completely different physiological position from a rider doing five hard sessions a week while managing a restructure at work, a sick child, and a mortgage renewal. Same training. Vastly different stress load. The power file looks identical. The body's capacity to absorb that training is not even close.
Note it. "Work stress: high." "Family stuff: rough week." "Things are calm." One line. It will explain more failed sessions than any metric your head unit records.
5. Nutrition Notes
Not a calorie count. Not macros to the gram. Just the relevant bits.
"Skipped breakfast, bonked at 90 minutes." "Tried the new gel, stomach was fine." "Big dinner last night, felt sluggish this morning." "Nailed 80g carbs per hour, felt strong the whole way."
Over time, these notes reveal your fuelling patterns more honestly than any app. You will see which pre-ride meals work, which mid-ride fuelling strategies hold up beyond three hours, and which recovery habits correlate with good sessions the following day. Sam Impey talks about this constantly — the best fuelling strategy is the one you can actually execute consistently, and that is personal. Your log finds it.
6. One Sentence on How It Went
Not a race report. One sentence. "Intervals felt controlled, could have added a rep." "Legs were dead from the start, cut it short." "Endurance ride, nice and easy, enjoyed it."
This sentence is what you will read during your weekly review, and it is what a coach reads when looking at your week. It turns a power file into a story. Power says 237 watts normalised for 90 minutes. Your sentence says "first ride after three days off, felt rusty for 20 minutes then everything came together."
The sentence is the context. The context is the point.
The 60-Second Post-Ride Habit
Timing matters here. You need to write this down within 30 minutes of finishing the session, ideally while you are still in your kit, before the shower, before the real world comes flooding back in.
Here is why. Subjective memory degrades fast. An hour after a ride, you remember it differently. By the evening, you remember it through the lens of whatever happened at work that afternoon. By the next day, it is gone — replaced by a vague impression that the ride was "fine" or "hard."
The habit takes 60 seconds. Literally. Pull out your phone, open whatever you use, and type six short things:
- RPE: 7
- Sleep: 6 hours, average quality
- Mood: a bit flat
- Stress: work deadline, medium-high
- Nutrition: skipped lunch, fuelled OK on the bike
- Session: threshold reps, first two felt hard, last two clicked
That is it. Sixty seconds. Done. You now have more useful training data than 90% of the riders with power meters and coaching subscriptions.
Tools vs Pen and Paper
People ask me this all the time: what should I use? TrainingPeaks? A spreadsheet? A notebook? An app?
The answer is refreshingly simple: whatever you will actually do. Consistently. For months.
A leather-bound Moleskine filled in with a fountain pen is worth more than a beautifully designed spreadsheet that you stopped filling in after three weeks. A voice note into your phone is worth more than a custom Notion template that requires fourteen clicks to open.
That said, here is what works for different types of riders.
TrainingPeaks Post-Session Comments
If you already use TrainingPeaks, this is the lowest-friction option. Every completed workout has a comment field. The data is already there — the power, the heart rate, the route. Your job is just to add the six things listed above. The advantage: when you or your coach reviews the week, the subjective notes sit right next to the objective data. Everything is in one place.
A Simple Spreadsheet
Google Sheets or Excel. One row per day. Columns for the six items. Takes 60 seconds to fill in, infinitely searchable, easy to spot trends over weeks and months. If you are the kind of person who likes looking at data in tabular form, this is hard to beat.
Pen and Paper
Old school. Still works. Joe Friel kept paper logs for years — and coached athletes who did the same — long before any of the current platforms existed. The act of writing by hand forces a different kind of reflection than typing. You slow down. You think about what to say. The downside: it is harder to search and harder to review patterns across months. But if digital tools create friction for you, grab a notebook and a pen and do it that way.
Phone Notes
The fastest option. Open Notes, type six lines, done. No formatting, no template, no login. The notes app you already have on your phone, used in the most basic possible way. Not glamorous. Effective.
The Weekly Review: Five Minutes That Change Everything
Recording data you never look at is the same as not recording it. The weekly review is where the value lives.
Sunday evening. Five minutes. That is the commitment.
Pull up the past seven sessions. Read through your notes — not the power data, the notes. Ask three questions:
What went well this week? Which sessions felt good? Was there a pattern? Did they follow rest days? Good sleep? Low stress?
What did not go well? Which sessions were a struggle? Was there a pattern? High stress? Poor sleep? Skipped meals? Back-to-back hard days?
Is a pattern emerging? This is the question that makes the whole thing worth doing. After three or four weeks of honest weekly reviews, you start seeing things. Your Tuesday session always goes badly because Monday is your most stressful work day. Your Saturday ride is always your best because you sleep in on Friday night. Your RPE spikes every time you skip breakfast before a morning session.
These are not complicated insights. They are obvious once you see them written down in front of you. But without the log and the review, they stay invisible — buried under the noise of daily life and daily data.
Pattern Spotting Over Months
The weekly review catches the small stuff. The monthly review catches the big stuff.
Once a month — first Sunday of the month, or whenever works — zoom out. Look at four weeks of logs. Look for the larger patterns that only emerge at this timescale.
Are you consistently losing form in the third week of every training block? That is a recovery issue, and it is fixable — your build weeks might be one week too long for your current capacity.
Does every period of high life stress correlate with a run of missed sessions? Not because you are lazy. Because your body is already under load and the motivation to add more simply is not there. That is physiology, not willpower. Knowing the pattern means you can plan for it: schedule lighter weeks when you know work is going to be heavy.
Do your best performance periods always follow a week where sleep averaged over seven hours? Now you have a concrete, personal reason to protect your sleep — not because a podcast told you to, but because your own data proves it makes you faster.
This is the kind of insight that coaches look for. When I talk to coaches on the podcast — and I have talked to hundreds — the ones who get the best results from their athletes are the ones who insist on this kind of contextual tracking. The power file is the skeleton. The training log is what puts flesh on it.
What Coaches Actually Look At
If you are working with a coach, or thinking about it, here is what happens on the other side of the screen.
A good coach opens your week and does not start with the power data. They start with the notes. They want to know how the week felt. They want to know whether the prescribed sessions matched reality — not in watts, but in effort and experience. They want to know whether life got in the way, and if it did, how you responded.
John Wakefield has talked about this openly. At Bora-Hansgrohe, the wellness questionnaire that riders complete each morning is not optional. It is not a box-ticking exercise. It is the first thing the coaching staff reads, because it tells them whether the rider is in a state to absorb the training that is planned for the day. If the subjective data says the rider slept badly, is feeling flat, and has elevated muscle soreness, the power file from yesterday is secondary. The question becomes: do we modify today?
For amateur riders working with coaches remotely — which is most of you — the training log is even more important. Your coach cannot see you. They cannot watch you warm up and notice that your pedal stroke looks ragged. They cannot hear the tone of your voice when you say the session was "fine." All they have is the data and your notes. If the notes are thin — or worse, absent — your coach is flying blind. They are making decisions about your training based on half the picture.
Fill in the log. Give your coach the full picture. It is the single easiest way to get more value from a coaching relationship.
Making It Stick
The reason most training logs fail is not that people do not see the value. It is friction. The habit has to be easier than not doing it.
Three things that help.
Attach it to an existing habit. You already save your ride on Garmin or Wahoo. You already open Strava. Make the log entry the thing you do immediately after — before the shower, before you put your phone down. Habit stacking. It works.
Keep it short. If your log entry takes more than 90 seconds, you have made it too complicated. Six items. Sixty seconds. That is the target. If you find yourself writing paragraphs, pare it back. You are not writing a diary. You are leaving breadcrumbs for future you.
Do the weekly review. This is what makes the daily habit feel worthwhile. When you sit down on Sunday and see patterns jumping off the page — sleep explaining RPE, stress explaining missed sessions, nutrition explaining bonks — the daily 60 seconds stops feeling like a chore. It starts feeling like an investment. Because that is exactly what it is.
You do not need a fancy app. You do not need a coaching subscription. You need 60 seconds of honesty after every session and five minutes of review every Sunday. That is a training log. And over months and years, it will tell you more about your cycling than any power meter ever built.
If you want to see how other riders track this stuff and share what they are learning, come and have a look at the Roadman Cycling community on Skool. It is where riders like you — serious about getting better, done with guessing — compare notes and push each other forward.