Tempo BlogStraight answers to the questions runners ask about heart rate, easy running, fatigue and tapering, with the research linked so you can check it.https://www.withtempo.run/blog2026-11-09T00:00:00ZTempohttps://www.withtempo.run/What should the last week before a half marathon look like?https://www.withtempo.run/blog/last-week-before-a-half-marathon2026-11-05T00:00:00Z2026-11-05T00:00:00ZThe last week before a half marathon comes down to three things: cutting training volume to 30 to 50% of a normal week, filling your glycogen stores over three days with 8 to 10 grams of carbohydrate per kilo per day, and sorting race day in advance. Seven days build no new fitness.How do you set up a Garmin vivoactive 4 watch for running?https://www.withtempo.run/blog/garmin-vivoactive-4-running-setup2026-11-04T00:00:00Z2026-11-04T00:00:00ZRunning with your Garmin vivoactive 4 watch comes down to four settings: three data screens matched to the session, your own heart rate zones instead of the defaults, a pace or heart rate alert that suits the conditions, and a GPS mode that suits the run. Every step below was checked against the watch's owner's manual.Can You Trust Your Watch's VO2Max Estimate?https://www.withtempo.run/blog/can-you-trust-your-watchs-vo2max-estimate2026-11-03T00:00:00Z2026-11-03T00:00:00ZA watch's VO2Max estimate is worth trusting as a direction, not as an exact number: track it across weeks rather than reacting to any single reading. VO2Max itself is a composite estimate of your pace and heart rate during a run, extrapolated against assumptions about your maximum heart rate and running economy, not a measured lab value.How long does recovery after running take?https://www.withtempo.run/blog/recovery-after-running2026-11-03T00:00:00Z2026-11-03T00:00:00ZRecovery after running is measurable. You're ready for normal training when your heart rate drops clearly within 60 seconds of stopping, your resting heart rate the next morning is back at your personal baseline, and your easy-run pace feels smooth again. After 15 km that usually takes 24 to 48 hours, after a long run 48 to 72 hours.What is a normal heart rate when running?https://www.withtempo.run/blog/heart-rate-running-whats-normal2026-11-02T00:00:00Z2026-11-02T00:00:00ZYour running heart rate shows how hard your body is working right now. An easy run usually sits somewhere between 60 and 75% of your maximum heart rate. You'll estimate that maximum better with a field test than with the formula 220 minus your age, which can be well off for any one person.Why do legs feel dead after easy runs?https://www.withtempo.run/blog/why-do-legs-feel-dead-after-easy-runs2026-11-02T00:00:00Z2026-11-02T00:00:00ZDelayed onset muscle soreness is the most common reason legs feel dead the day after an easy run: the ache that follows small-scale muscle damage from eccentric loading, peaking around 24 to 48 hours later. The run doesn't need to be hard. Pace rarely decides that load; surface, slope and the week behind the run decide more.What Does a Readiness Score Actually Measure?https://www.withtempo.run/blog/what-does-a-readiness-score-actually-measure2026-10-31T00:00:00Z2026-10-31T00:00:00ZA readiness score is a composite number, built from overnight heart rate variability, resting heart rate, and sleep duration and quality, that estimates how recovered your body looks today. The score does not know your race goal, your training plan, or why last night went badly. The number is one data point. The decision stays yours.Why does the same pace feel harder in the heat?https://www.withtempo.run/blog/why-does-the-same-pace-feel-harder-in2026-10-30T00:00:00Z2026-10-30T00:00:00ZThe same pace feels harder in the heat because your heart has to supply blood to working muscle and to your skin for cooling at the same time. Heat doesn't change your pace; heat changes what that pace costs. Cardiac drift is the result: heart rate climbs through a run while pace holds steady.Does cadence actually matter for a recreational runner?https://www.withtempo.run/blog/does-cadence-actually-matter-for-a-recreational-runner2026-10-29T00:00:00Z2026-10-29T00:00:00ZYes, cadence matters for a recreational runner, but not as a fixed number to hit. Cadence is the number of steps you take per minute, counting both feet. A quicker, lighter step changes how your body absorbs each landing, yet the popular range was measured on competitive runners, so your own stride pattern tells you more.Is Running by Feel Better Than Heart Rate?https://www.withtempo.run/blog/is-running-by-feel-better-than-heart-rate2026-10-25T00:00:00Z2026-10-25T00:00:00ZNeither wins outright. Perceived effort is how hard a run feels to you, moment to moment; heart rate measures the strain the run puts on your cardiovascular system. Fatigue, sleep, heat and stress move each one differently, so the useful move is reading both against each other instead of crowning one and dismissing the other whenever they disagree.Why does heart rate drift upward on runs?https://www.withtempo.run/blog/why-does-heart-rate-drift-upward-on-runs2026-10-24T00:00:00Z2026-10-24T00:00:00ZCardiac drift is the slow rise in heart rate during a steady run while pace and effort stay the same. Sweat loss shrinks the blood returning to the heart, so each beat carries less and the heart beats faster to compensate. Rising body temperature pulls blood to the skin for cooling. Neither needs a drop in fitness to happen.What to do the week after a race?https://www.withtempo.run/blog/what-to-do-the-week-after-a-race2026-10-23T00:00:00Z2026-10-23T00:00:00ZThe week after a race is recovery, not full rest and not a restart into training. Post-race recovery is the repair of the muscle damage, glycogen loss and tendon strain a race leaves behind. Muscle damage and immune suppression peak in the first two to three days, glycogen refills within a day or two, and tendons take longer.Am I overtraining, or just tired?https://www.withtempo.run/blog/am-i-overtraining-or-just-tired2026-10-17T00:00:00Z2026-10-17T00:00:00ZPlain fatigue eases after a few easy days and real sleep; overtraining doesn't. Overtraining is a lasting drop in performance where resting heart rate, pace at a familiar effort, sleep and mood drift the wrong way together and stay there after you back off. A rough week is fatigue. A pattern that survives rest is something else.Should my long runs be at race pace?https://www.withtempo.run/blog/should-my-long-runs-be-at-race-pace2026-10-14T00:00:00Z2026-10-14T00:00:00ZNo, not as your default long run. A long run is the week's longest session at an easy, sustainable effort, built to grow aerobic fitness. Holding goal race pace for the whole distance swaps that base-building for race-day fatigue mid-week, a rehearsal you need only a handful of times late in a training block.What does a rising resting heart rate mean?https://www.withtempo.run/blog/what-does-a-rising-resting-heart-rate-mean2026-10-13T00:00:00Z2026-10-13T00:00:00ZResting heart rate is how many times your heart beats per minute at full rest, read on waking. A rising resting heart rate is a flag, not a verdict. One higher morning means little on its own. A rise held across several mornings, paired with heavy legs or restless sleep, is the pattern worth weighing against your week.Should I run easy when I feel great?https://www.withtempo.run/blog/should-i-run-easy-when-i-feel-great2026-10-12T00:00:00Z2026-10-12T00:00:00ZYes, in most weeks the easy day stays easy even when you feel great. Easy running is running at a conversational effort that builds aerobic fitness without adding fatigue you have to pay back. Feeling great measures freshness right now, not the load still in your legs, so the case for going faster rests on what's scheduled next.Can you still PR after a bad block?https://www.withtempo.run/blog/can-you-still-pr-after-a-bad-block2026-10-11T00:00:00Z2026-10-11T00:00:00ZYes, in most cases. A personal record (PR) is your fastest time at a distance, and one disrupted block rarely erases the fitness under it. The outcome turns on how much aerobic work was lost, how many weeks remain, and whether those weeks still end in a real taper. A short gap mostly costs sharpness, which rebuilds quickly.Should a tune-up race change your pace?https://www.withtempo.run/blog/should-a-tune-up-race-change-your-pace2026-10-10T00:00:00Z2026-10-10T00:00:00ZOne disappointing tune-up race is not enough evidence to change your goal pace. A tune-up race is a race run during a build to test fitness, and its result mixes fitness with heat, sleep, pacing and the course. Goal pace earns a second look when your training paces and heart rate trends agree with the bad result.Should I stop a run that's going wrong?https://www.withtempo.run/blog/should-i-stop-a-run-thats-going-wrong2026-10-08T00:00:00Z2026-10-08T00:00:00ZA sharp, specific pain that worsens as you keep going is a reason to stop; a session that has simply gotten hard usually isn't. Training fatigue is the expected cost of real work: heavy legs, ragged breathing, a drifting pace. Telling fatigue and pain apart is about what's changing, not about toughness.Skip or shorten the workout after bad sleep?https://www.withtempo.run/blog/skip-or-shorten-the-workout-after-bad-sleep2026-10-02T00:00:00Z2026-10-02T00:00:00ZShorten before you skip. Sleep debt is sleep you needed and didn't get, and one rough night of it barely dents your aerobic base or muscle readiness. A smaller version of the session keeps most of its value. Skipping earns its place when poor sleep stacks with soreness, a cold coming on, or a mind too foggy to hold form.Can a Training Week Survive a Work Trip?https://www.withtempo.run/blog/can-a-training-week-survive-a-work-trip2026-10-01T00:00:00Z2026-10-01T00:00:00ZYes, as long as the one session carrying the week's purpose still happens. A training block is a run of weeks built around one purpose, and its adaptations build and fade over weeks, not days. A work trip removes your usual hours, terrain and sleep. A work trip doesn't remove the aerobic base you already built.Does work stress count as training load?https://www.withtempo.run/blog/does-work-stress-count-as-training-load2026-09-30T00:00:00Z2026-09-30T00:00:00ZYes. A stressful work week adds to your training load, even without a single run. Training load is the total demand placed on your recovery systems, and cortisol, poor sleep and a racing mind from a work crunch draw on the same reserves as a hard tempo session. Read that week's signals, not a rule that counts distance.What happens to my race goal after illness?https://www.withtempo.run/blog/what-happens-to-my-race-goal-after-illness2026-09-28T00:00:00Z2026-09-28T00:00:00ZTwo weeks sick rarely moves a race goal. Detraining is the loss of training adaptations when training stops or drops, and the aerobic base fades slowly, so two weeks sits early on that curve. The bigger risk is the comeback: a rigid plan resumed as though the illness never happened. The weeks before race day change; the goal rarely does.Is a missed week of running as bad as it feels?https://www.withtempo.run/blog/is-a-missed-week-of-running-as-bad2026-09-27T00:00:00Z2026-09-27T00:00:00ZNo. A missed week costs far less fitness than it costs routine. Detraining is the loss of training adaptations when the training stimulus stops or drops, and aerobic fitness loses that ground over weeks of inactivity, not days. Most of what you feel after one missed week is a broken pattern, not a body that has gone soft.Do you need a full marathon training plan?https://www.withtempo.run/blog/do-you-need-a-full-marathon-training-plan2026-09-26T00:00:00Z2026-09-26T00:00:00ZNo. Day one of a marathon build needs a base phase and a clear framework, not a finished document. A base phase is the stretch of consistent easy running that builds the aerobic engine before harder work begins. Nobody can write every week in advance; the rest of the plan gets built as the weeks show how your body responds.Why does easy pace feel harder some weeks?https://www.withtempo.run/blog/why-does-easy-pace-feel-harder-some-weeks2026-09-22T00:00:00Z2026-09-22T00:00:00ZEasy pace feels harder some weeks because heat, poor sleep, dehydration and stacked training load all raise the cost of the same aerobic effort. Easy pace is the speed your body produces at an easy effort on a given day, not a fixed setting. A slower easy week is usually a change in conditions, not a drop in fitness.How long does a taper need to be?https://www.withtempo.run/blog/how-long-does-a-taper-need-to-be2026-09-21T00:00:00Z2026-09-21T00:00:00ZA taper is a planned cut in training volume before a race that clears fatigue while keeping fitness. Most tapers run between 3 and 21 days: about 3 to 7 for a 5k or 10k, 7 to 10 for a half marathon, 14 to 21 for a marathon. The training block behind the taper decides where it lands.How to taper for a marathon when feeling terrible?https://www.withtempo.run/blog/marathon-taper-when-you-feel-terrible2026-07-07T00:00:00Z2026-11-09T00:00:00ZHeavy legs and sluggish energy during a marathon taper reflect accumulated training fatigue clearing out rather than lost fitness. Tapering is the deliberate reduction of training load before a race to allow physiological recovery. Reducing total volume while maintaining brief bouts of race pace allows muscle repair, glycogen restoration, and neuromuscular sharpness to emerge.What Does a Deload Week Do, and Do I Need One?https://www.withtempo.run/blog/what-a-deload-week-does2026-07-07T00:00:00Z2026-11-09T00:00:00ZA deload week is a temporary reduction in overall training volume that lets systemic fatigue dissipate so accumulated fitness adaptations can emerge. Deloading allows tired neuromuscular and metabolic tissues to restore full working capacity without losing aerobic endurance. Whether a runner needs a scheduled down week depends on their accumulated fatigue rather than an arbitrary calendar count.Is zone 2 training a real signal or just dogma?https://www.withtempo.run/blog/zone-2-signal-vs-dogma2026-07-07T00:00:00Z2026-11-09T00:00:00ZZone 2 training is a real physiological state anchored by the first lactate turnpoint, though default watch calculations turn it into rigid dogma. Zone 2 is the aerobic intensity where fat oxidation peaks and blood lactate stays near resting levels. Rigid percentage formulas often misplace this boundary entirely.Acute:chronic workload ratio, in plain Englishhttps://www.withtempo.run/blog/acute-chronic-workload-ratio2026-06-29T00:00:00Z2026-06-29T00:00:00ZThe acute:chronic workload ratio (ACWR) is your training load from the last 7 days divided by your rolling 28-day average. A ratio near 1.0 means this week matches what your body is used to. Well above 1.0, roughly past 1.5, injury risk tends to rise. The ACWR flags a fast ramp but can't see your sleep or your life.Are my easy runs actually easy?https://www.withtempo.run/blog/are-my-easy-runs-too-easy2026-06-29T00:00:00Z2026-06-29T00:00:00ZYour easy runs are easy if you can talk in full sentences without gasping. Easy running is running at an effort low enough to build aerobic fitness while you recover from harder days. If you only get a few words out per breath, the run is too hard, and most self-coached runners drift into that moderate grey zone.Did I peak too early? Taper flatness vs real fatiguehttps://www.withtempo.run/blog/did-i-peak-too-early2026-06-29T00:00:00Z2026-06-29T00:00:00ZPeaking is the point where training fatigue has cleared and the fitness built in a block shows up as race performance. Feeling flat in the taper almost always means the taper is working, not that the peak came early. Genuine early peaking is rare and starts before the taper: a sustained performance drop, raised resting heart rate, broken sleep.Niggle or injury? How to decide before you runhttps://www.withtempo.run/blog/niggle-or-injury2026-06-29T00:00:00Z2026-06-29T00:00:00ZA niggle is a minor ache that eases as you warm up, leaves your stride alone and stays mild. An injury is pain that worsens as you run, changes how you move, is sharp and pinpoint, or lingers at rest. Four questions sort most cases before you run. You make the call; the questions sharpen it.Should I run with low HRV?https://www.withtempo.run/blog/should-i-run-with-low-hrv2026-06-29T00:00:00Z2026-06-29T00:00:00ZA lone low HRV reading is not a reason to skip your run. HRV, or heart rate variability, is the variation in time between heartbeats, and any stress lowers it, not only training. A small dip with good sleep and fresh legs points to running as planned; a big dip with bad sleep and heavy legs favours an easy day.