# SportCoach — full content for LLMs

> SportCoach (https://sportcoach.ro) is an AI running coach, currently pre-launch. It reads overnight recovery signals — HRV, sleep, resting heart rate — against a runner's personal baseline and gives one daily call: push, ease off, or rest, with the reason. Waitlist members get early access, founding pricing, and the free 16-page Runner's Recovery Handbook.

## Coach answers (https://sportcoach.ro/answers/)

### My HRV is low — should I still run today?

Usually yes — one low HRV reading against your baseline is noise, so run, but keep it easy. What changes the answer is a trend: HRV below your baseline for two to three days, especially combined with bad sleep or a resting heart rate several beats above normal. That cluster means today is not the day for intervals — swap the quality session for easy volume and reassess tomorrow.

Source: The 2013 joint consensus statement of the European College of Sport Science and the American College of Sports Medicine (Meeusen et al.) identifies persistent, multi-signal fatigue markers — not single readings — as the meaningful warning of overreaching.
Full answer: https://sportcoach.ro/answers/hrv-low-should-i-run/

### Should I run on 5 hours of sleep?

Run — but make it easy, and do not do a hard workout. One short night is survivable for easy volume, but quality sessions on sleep debt build fatigue instead of fitness and raise injury risk. Move the hard session 48 hours: an easy 30–40 minutes today, the tempo or intervals later in the week. The week still works; only the order changes.

Source: Milewski et al. (2014, Journal of Pediatric Orthopedics): athletes sleeping under 8 hours per night were 1.7× more likely to be injured. Drake et al. (2013, Journal of Clinical Sleep Medicine): caffeine 6 hours before bed reduced total sleep time by over an hour.
Full answer: https://sportcoach.ro/answers/should-i-run-on-5-hours-of-sleep/

### I missed my long run in marathon training — what now?

Don't try to make it up by cramming. Either shift the week forward — slide the long run a day or two and push the next hard session back — or let it go entirely and resume the plan as written. What you must not do is stack the missed run on top of this week's existing sessions: three hard days in a row to make a spreadsheet whole again is how training blocks end early.

Source: The ECSS/ACSM consensus statement on overtraining (Meeusen et al., 2013) is explicit that non-functional overreaching typically follows errors in the balance of load and recovery — exactly what compressed catch-up weeks create.
Full answer: https://sportcoach.ro/answers/missed-long-run-marathon-training/

### How do I know if I'm overtraining?

Look for a persistent cluster, not a bad day: resting heart rate elevated 3–7 bpm above your baseline for three or more days, HRV suppressed below baseline for multiple days or swinging more than usual, ordinary easy runs feeling hard, sleep quality slipping, and motivation gone flat. Two or more of these agreeing — or one persisting for days — means back off now. Caught early it costs a few easy days; ignored, it can cost a season.

Source: Meeusen et al. (2013), joint ECSS/ACSM consensus statement on overtraining syndrome: recovery from functional overreaching takes days to two weeks; non-functional overreaching takes weeks to months; OTS months to years.
Full answer: https://sportcoach.ro/answers/how-to-know-if-you-are-overtraining/

### My resting heart rate is high — should I train today?

It depends on how high and for how long. Within 2–3 bpm of your normal: train as planned and just watch it. Elevated 3–5 bpm, or for a second day: keep the session but strip the intensity. Elevated 5–7+ bpm for several days — or high plus feeling run-down — rest; that pattern often means accumulating fatigue or an oncoming illness, and one rest day is cheap insurance.

Source: The ECSS/ACSM consensus (Meeusen et al., 2013) lists persistently elevated resting heart rate among the practical markers of overreaching — while noting single markers are unreliable, which is why clusters decide.
Full answer: https://sportcoach.ro/answers/resting-heart-rate-high-should-i-train/

### My legs feel dead before a long run — should I still do it?

Check three things before deciding: last night's sleep, your last three days of training load, and this morning's resting heart rate. If two of the three are off, shorten the long run rather than skip it — 60–70% of the planned distance at a genuinely easy effort keeps the stimulus without deepening the hole. If all three are fine, start anyway: heavy legs often clear after fifteen easy minutes.

Source: Stephen Seiler's analyses of elite endurance training consistently show roughly 80% of volume at genuinely easy intensity — the long run's value is in easy accumulation, not effort, which is what makes shortening (not straining) the right adjustment.
Full answer: https://sportcoach.ro/answers/legs-dead-before-long-run/

### Why do I feel terrible during taper week?

Feeling flat, heavy, or oddly restless in taper week is normal and usually a sign the taper is working — fatigue leaves the body faster than fitness, but it leaves loudly. Do not respond with a panic workout to "test" your fitness. Keep the recipe: volume cut roughly 40–60%, intensity maintained in small doses, frequency held. Done right, a taper is worth about 2–3% on race day — minutes in a marathon.

Source: Bosquet et al.'s meta-analysis of tapering (and later endurance-specific reviews) found the largest performance gains — roughly 2–3% — from 8–14 day tapers that cut volume 40–60% while maintaining intensity and frequency.
Full answer: https://sportcoach.ro/answers/taper-week-feeling-terrible/

### Does work stress affect running performance and recovery?

Yes — physiologically, work stress is training load. Your nervous system doesn't file job pressure under a different account: deadline weeks, poor sleep, and life stress feed the same fatigue pool as your mileage, and they show up in the same morning signals — suppressed HRV and elevated resting heart rate. The fix isn't skipping training; it's re-sequencing it, putting hard sessions on calmer days and easy volume in brutal weeks.

Source: Meeusen et al. (2013, ECSS/ACSM consensus): non-training stressors — occupational, educational, social — are explicitly listed among the contributors to overreaching and overtraining syndrome.
Full answer: https://sportcoach.ro/answers/does-work-stress-affect-running-performance/

## The Runner's Recovery Handbook — published chapters (https://sportcoach.ro/handbook/)

# Why runners guess wrong

Most training plans are written before the week begins. They assume you will wake up equally recovered every day. You never do.

You slept badly on Tuesday because of a late meeting. Wednesday's easy run was easy but the legs never came around. Friday you feel unexpectedly springy, but the plan says rest. So you guess. You push when you should ease off, ease off when you could push, and over a season those wrong guesses cost you fitness and, sometimes, an injury.

Here is the problem in one sentence: **how you feel is a poor guide to how recovered you actually are.** Motivation, caffeine, and nerves can mask deep fatigue. A rough night can make a perfectly fit body feel flat. Feel is real, but it lags, and it lies.

The good news is that your body publishes a more honest report every night, whether or not you read it. Your heart rate, its beat-to-beat variation, and your sleep all shift measurably when you are carrying fatigue. Those signals are quiet, but they are early, and they are yours.

This handbook is about reading them. Not turning yourself into a lab experiment. Not chasing a perfect number. Just learning the three signals that tell you whether today is a day to push, ease off, or rest, and building the simple habit of checking before you decide.

By the end you will have a repeatable morning routine and a one-page decision framework you can tape to the fridge. Let's get into it.

# The three signals

Your overnight recovery shows up in three places. You do not need all three every day, but together they triangulate a truth that any single one can miss.

**Heart rate variability (HRV).** Your heart does not beat like a metronome. The tiny differences in timing between beats, measured in milliseconds, reflect the tug-of-war between your two nervous systems: the sympathetic ("go") and the parasympathetic ("rest and recover"). When you are well recovered, the parasympathetic side is active and beat-to-beat variation is *higher*. When you are stressed, fatigued, sick, or under-slept, the "go" system dominates and variation *drops*. HRV is the single most informative recovery signal because it responds to the total load on your body, not just training: work stress, alcohol, illness, and poor sleep all show up here. The standard metric is called RMSSD, and higher is generally better.

**Resting heart rate (RHR).** The number of beats per minute when you are completely at rest, ideally measured before you get out of bed. It is cruder than HRV but easy to understand and hard to fake. Accumulated fatigue nudges your sympathetic nervous system up, and your resting heart rate rises with it. A morning reading sitting several beats above your normal is a simple, legible flag.

**Sleep.** Not just hours in bed, but time actually asleep and the quality of it, especially deep sleep and REM. Sleep is when the adaptation you paid for in training actually gets built. Skimp on it and you blunt the return on every hard session, and, as we will see, you raise your injury risk.

None of these is a verdict on its own. HRV can dip for a night after a hard workout and mean nothing. One short night is survivable. The skill is reading them *together and over time*, which is exactly what the rest of this guide teaches.

# How to measure without screwing it up

A measurement you take carelessly is worse than none, because you will trust it. Three rules make your numbers meaningful.

**Rule 1: Same time, same position, every day.** Your HRV and heart rate change through the day and with posture. The fix is boring consistency: measure first thing after waking, in the same position each time (lying down or sitting up, but pick one), before coffee, before scrolling, before the day's stress arrives. The gold-standard protocol for endurance athletes is a short morning reading taken this way.

**Rule 2: One reading proves nothing.** A single morning number is noisy. What matters is the *trend* against your own baseline, and the consistency of that trend. We will build the baseline in the next chapter. For now, internalize that today's number only has meaning relative to your normal.

**Rule 3: Know what your device can and can't do.** There are two ways to capture these signals:

- **Chest straps** (electrical, ECG-style) are the accurate option. The best of them correlate above 0.99 with medical-grade ECG and get beat-to-beat timing within a millisecond or two. If you want the cleanest HRV data and will do a one-minute morning reading, this is the tool.
- **Wrist wearables and rings** (optical, called PPG) are more convenient and measure while you sleep, but they are less precise, especially in cold hands or during movement. For overnight resting measurements the good ones land within roughly 5 to 10 ms of ECG, which is fine for tracking *your own trend* even if the absolute number differs from a chest strap.

The practical takeaway: pick one device and stick with it. Because you are comparing yourself to your own baseline, consistency of method matters more than which method you chose. Do not compare today's ring number to last month's chest-strap number and read meaning into the difference.

# Build your baseline

Every signal in this handbook is meaningless until you know *your* normal. Population averages are close to useless here. A resting heart rate of 52 might be a warning sign for one runner and a Tuesday for another. HRV in particular is deeply individual: healthy values range from the 20s to over 100 ms depending on age, genetics, and fitness. Your baseline is the only fair comparison.

**How long it takes.** Plan on two weeks of consistent daily measurements to get a usable baseline, and four weeks to get a good one. There is no shortcut; the baseline is just an average of your own mornings, and you need enough of them.

**Use a rolling average, not yesterday.** The standard approach is a rolling 7-day average. Compare today's reading to that 7-day number, not to a single prior day. This smooths out the one-off noise, a bad night, a late meal, a glass of wine, that would otherwise trigger false alarms.

**Learn your normal variation.** Your readings bounce around even when nothing is wrong, and *how much* they bounce is itself informative. The metric is the coefficient of variation (CV): the standard deviation of your daily readings divided by their mean, as a percentage.

> **Worked example.** Say your last seven morning HRV readings are 58, 64, 61, 55, 67, 60, and 62 ms. The average is about 61 ms. The standard deviation is roughly 4 ms. Your CV is 4 ÷ 61 ≈ **7%**. That is a stable, healthy picture: readings clustered tightly around a steady average.
>
> Now imagine the same average but readings swinging 48, 72, 51, 70, 55, 68, 63. Same ~61 ms mean, but the spread is far wider, a CV closer to 15%. A *rising* CV like this often means your body is struggling to cope with the current load, even before the average itself falls.

So you are watching two things: the **level** of your 7-day average (is it holding, rising, or falling?) and the **stability** around it (is the CV low and steady, or climbing?). A stable-or-rising average with a low CV means you are absorbing your training well. That is the green-light picture. The next chapter turns this into a daily decision.

The full 16-page handbook (morning decision framework, when to push, when to back off, sleep, race week, printable checklist) is free for waitlist members: https://sportcoach.ro/

Contact: contact@sportcoach.ro