Keeping a Training Log: What Data Should You Record?.

The core data a HYROX athlete should record in a training log are: the session's date and type, duration or distance, loads and reps used, rate of perceived exertion (RPE), how you felt during and after the session, plus recovery indicators like sleep and overall fatigue. Within a few weeks, these few data points clearly show which training is working, where you're stuck, and when you need to rest. The log doesn't have to be perfect; it just has to be consistent.

Why a training log? The limits of relying on memory

Most athletes think they remember what they did on which day last month. In reality, memory is quite selective, especially with a busy work and training schedule. Good sessions get exaggerated, bad ones get forgotten, and minor aches and sleepless nights don't stick at all. A few weeks later, when performance drops, finding the cause becomes nearly impossible.

A training log fills that gap. A consistently kept log lets you see progress concretely, spot overload early, understand which session types benefit you most, and communicate more effectively with your coach. In preparation like HYROX that involves both strength and endurance, this record is especially valuable for seeing how different types of training affect each other.

Core data: what to record every session

The minimum data set to record for each session is short. If noting it within a few minutes of finishing becomes a habit, the log stops being a chore.

RPE, the rating of perceived exertion, is perhaps the most valuable data point in your log. The same workout can feel very different on different days; RPE captures that difference. By multiplying a session's duration by its RPE, you can calculate a simple “session load” and track your weekly load. How to use the RPE scale in the RPE article we covered in detail.

HYROX-specific data: logging stations and splits

For a HYROX athlete, some specific records are useful in addition to the general data. These reflect the structure of the race and let you see progress station by station.

• Station times: Times over standard distances like SkiErg 1000 m and Row 1000 m. These are repeatable, comparable tests.
• Erg data: Average split (time per 500 m), stroke rate, and damper setting.
• Wall ball and burpee set structure: How many sets, how many reps, how long the breaks lasted.
• Sled load and distance: The weight used, surface type, and approximate time. Adding this note matters because surface differences change how the sled feels a great deal.
• Compromised running paces: Time and feel for the first 1 km after a station.

Recording a separate split for each run and station after a simulation or race is the foundation for finding your weak link. How to do this analysis in the weak station analysis article in more detail.

Recovery data: recording the invisible half

Training isn't only the work you do in the gym; recovery is part of it too. Many athletes log only their sessions and ignore recovery. Yet a significant share of performance dips are related to sleep, stress, and nutrition.

A simple recovery log you can fill in each morning in a few seconds might include:

1. Sleep duration and quality: How many hours did you sleep, and how was sleep quality on a 1–5 scale?
2. Overall energy: On a 1–5 scale, how do you feel when you wake up?
3. Muscle soreness: Where, and how severe?
4. Stress level: Is stress high because of work, family, or other reasons?
5. Resting heart rate or HRV (if available): If you use a watch or app, note this value.

As this data accumulates over a few weeks, patterns emerge. For example, you might see your RPE rise in weeks when your sleep drops below a certain threshold, or soreness linger during high-stress periods. We cover the effect of sleep on performance in our sleep and performance article, and HRV tracking in our HRV article.

Interpreting your log: from data to decisions

Collecting data is half the job; the real value comes from reviewing it regularly. These questions work well for a short weekly review:

• How did this week's total training time and session load change compared with last week?
• Was the RPE for hard sessions what I expected, or did they feel harder than usual?
• Is there a dip in my sleep and energy data?
• Am I seeing progress in my strength and station data?

A few warning signs can indicate it's time to reduce load or plan a recovery week: several consecutive days of high RPE, declining sleep quality, lingering muscle soreness, and dropping motivation. Faced with this picture, the right step is usually to plan a deload week week.

At the end of each block, every 4–6 weeks, do a broader review. Repeating standard tests during this period (such as a 1000 m SkiErg, 1000 m Row, or 5 km run) and comparing them with your baseline shows whether the block actually worked.

Common logging mistakes

There are right and wrong ways to keep a training log too. The most common mistakes are:

• Too much data: Trying to fill in dozens of fields every session will make you abandon the log within a few weeks. A little data recorded consistently beats a lot of data recorded sporadically.
• Logging only the good days: Bad sessions teach you the most; skipping them distorts the picture.
• Not recording how you felt: Writing only numbers loses the context. Short notes like “legs heavy” or “work stress high” are very valuable.
• Never reviewing the data: Data that's recorded but never looked at is useless.
• Comparing yourself with others: The log is for seeing your own progress; it's not a tool for comparing yourself to other people's numbers.

Paper, spreadsheet, or app: which tool?

The right tool for a training log is the one you'll keep using. Each method has its own advantages, and knowing them makes the choice easier.

• Paper notebook: Distraction-free and ideal for quick notes after a session. But aggregating data, making charts, and comparing over the long term are difficult.
• Spreadsheet: Flexible; you can create your own columns, calculate weekly totals automatically, and draw simple charts. It takes a bit of setup.
• Sports watches and apps: Automatically collect running, heart rate, and sleep data. But they usually don't capture strength sessions, station structure, and subjective feel well, so they need to be supplemented with short manual notes.

For many athletes, the most practical solution is to combine these methods: pulling running and heart rate data automatically from the watch, and adding strength and station details to a spreadsheet or notebook. Whichever method you choose, logging the session the same day at the latest keeps the data accurate. Notes left until the next day are usually incomplete or wrong. We cover which watch data you really need to look at in our running watch and heart rate strap article.

A simple starter template

Whatever tool you use, you can try this simple starter template. One row per session, a short summary each week:

1. Session row: Date | Type | Duration/distance | Main load and reps | RPE | Short note.
2. Morning row: Bedtime | Sleep quality (1–5) | Energy (1–5) | Soreness (area and severity).
3. Weekly summary: Total time | Total session load | Best session | Hardest session | One note for next week.

It also helps to write your race goal and date at the top of the template. Seeing the goal every time you open the log each week reminds you what purpose the sessions serve and reduces the urge to add unplanned extra training. Noting the two or three main goals you set at the start of the block (for example, finishing wall balls with fewer breaks or keeping your easy run pace at a low heart rate) also makes the end-of-block review much more meaningful.

This template is more than enough for the first few weeks. Over time you'll see which data is truly useful to you and expand or simplify the template if needed.

Using your log with your coach at Hybrid

When you work with a coach, a training log becomes your most powerful communication tool. When your coach can see the whole week beyond the session they watched in the gym, including your sleep, stress, and how you felt, they can adjust your program much more precisely. At Hybrid, sharing this data in personal training and group classes makes it easier to shape the program around you. The weekly program structure on the program page on its own page.

If you notice recurring pain, unexplained fatigue, or a marked drop in performance in your log, don't settle for just recording it. Reduce the load, talk to your coach, and see a doctor if the problem persists. One of the log's most important jobs is catching signals like these early.