Quick start: 5 steps to begin today

1. Find your resting heart rate (RHR): wear your device during sleep or measure upon waking for 1 week; take the lowest value.
2. Estimate max heart rate (HRmax): use 208 − 0.7 × age as a starting point if you don’t have a test.
3. Create zones: set five zones based on HRmax or, better, lactate threshold heart rate (LTHR) if known.
4. Pick 2 to 3 zone-2 sessions per week for aerobic base, plus 1 to 2 higher-intensity sessions if recovered.
5. Track trends: watch resting HR and HRV over time; adjust training if recovery is poor.

Heart rate basics and zones

Your heart rate reflects how hard your body is working. Training in specific ranges—or zones—helps target particular adaptations.

• Zone 1 (Very easy, recovery): 50–60% of HRmax. Blood flow, technique, active recovery.
• Zone 2 (Easy aerobic): 60–70% of HRmax. Builds your aerobic base and fat oxidation; you can hold a conversation.
• Zone 3 (Moderate/tempo): 70–80% of HRmax. Improves endurance; speaking in short sentences.
• Zone 4 (Hard/threshold): 80–90% of HRmax. Raises lactate threshold; talk is limited to single words.
• Zone 5 (Very hard/VO2max): 90–100% of HRmax. Increases peak aerobic capacity; short, intense efforts.

Alternative method: calculate zones from your lactate threshold heart rate (LTHR). This often personalizes zones better than HRmax.

How to set your zones

Option A: Age‑based HRmax (simple)

HRmax estimate: 208 − 0.7 × age. Set zones as percentages of HRmax as shown above. This is a good first approximation.

Option B: Karvonen (uses heart rate reserve)

Heart Rate Reserve (HRR) = HRmax − Resting HR. Target HR = Resting HR + (Zone % × HRR). This accounts for your personal resting HR.

Option C: LTHR field test (more accurate)

1. Warm up 10–15 minutes easily.
2. Run or ride a 30‑minute time trial at the best pace you can sustain evenly.
3. Record your average heart rate during the final 20 minutes; that’s your approximate LTHR.
4. Set zones relative to LTHR. Typical run zones: Z1 <85% LTHR, Z2 85–89%, Z3 90–94%, Z4 95–99%, Z5 ≥100%.

Use caution: only test if you’re healthy and accustomed to hard efforts. Otherwise stick to HRmax-based zones and progress gradually.

Where to enter zones on your device

• Most wearables: open the companion app, find Heart Rate Zones in settings or user profile, choose method (HRmax, custom, or LTHR) and enter values.
• Enable “Zone alerts” or “HR alerts” for workouts so your watch notifies you if you drift off target.

Choosing and wearing a sensor

• Optical wrist sensors: convenient but can lag or spike during intervals, in cold weather, or with poor fit.
• Arm‑band optical sensors: often more stable than wrist for interval work.
• Chest straps (ECG): best accuracy for intervals and cadence‑heavy sports; moisten electrodes and ensure snug fit.

Fit tips: wear the device snug (but comfortable), 1–2 finger widths above the wrist bone, warm up before intervals, and lock the watch band to reduce bounce.

Using your wearable features

• Zone screens and alerts: show current heart rate and zone; set audio/vibration alerts to stay on target.
• Resting HR trend: a sudden increase (e.g., +5–10 bpm vs. baseline) can signal fatigue, heat stress, or illness.
• HRV (heart rate variability): higher, stable HRV generally indicates better recovery. Watch the trend, not a single day.
• Recovery time/readiness: helpful for planning intensity; treat as guidance, not a rule.
• Training load/strain: aim for gradual increases week to week. Avoid big spikes that raise injury risk.
• VO2max estimate: track long‑term trend; day‑to‑day changes are noisy.

Workouts by zone

Zone 1: Recovery

• 20–40 minutes easy walk, spin, or jog the day after hard sessions.
• Keep cadence smooth; finish feeling fresher than you started.

Zone 2: Aerobic base

• Run or ride 30–90 minutes steady in Z2, conversational pace.
• Newer athletes: start at 20–40 minutes, add 5–10 minutes weekly.

Zone 3: Tempo

• 2 × 10–20 minutes in Z3 with 5 minutes easy between.
• Great for durability when you’re time‑crunched. Avoid overusing if fatigue accumulates.

Zone 4: Threshold

• 3 × 8 minutes in upper Z3 to Z4 with 4 minutes easy between; total quality time 20–30 minutes.
• Expect HR to “creep” up after a few minutes due to lag; control by effort and breathing as well as HR.

Zone 5: VO2max

• 5–8 × 2–3 minutes very hard with equal recovery; keep form crisp.
• Because HR lags, use perceived effort early in each rep; HR should approach Z5 by the end.

Sample weekly templates

General fitness (3–4 days/week)

• Day 1: Z2 30–45 min
• Day 2: Strength 30–40 min + Z1 10–15 min
• Day 3: Intervals 6 × 2 min Z4–Z5, easy between
• Optional Day 4: Z2 40–60 min

Endurance focus (4–6 days/week)

• 2–3 Z2 sessions (45–90 min)
• 1 tempo or threshold session (Z3–Z4)
• 1 VO2max session (Z5) or hills
• 1 recovery day (Z1) and 1 full rest day
• Long day builds by 10% or less per week

Weight management or time‑crunched

• 3–4 sessions of 30–45 minutes
• Mix: Z2 steady days and 1 short interval day (e.g., 10 × 1 min hard, 1–2 min easy)
• Add daily low‑intensity movement (walks) to increase total energy expenditure

Advanced tips

• Aerobic decoupling: during long Z2 sessions, compare HR vs. pace or power. If HR rises >5–7% for the same pace/power, you may be underfueled, overheated, or need more aerobic base.
• Heat, dehydration, caffeine, and altitude all elevate HR for the same effort. Adjust zones down a notch on hot days or at altitude and hydrate early.
• Cross‑check with RPE: pair heart rate with perceived exertion and (for cyclists) power. If all three disagree, prioritize safety and perceived effort.
• Progression: increase total weekly time or quality minutes by 5–10% and insert a lighter recovery week every 3–4 weeks.

Safety and special cases

• If you’re new to exercise, have cardiovascular risk factors, or take heart‑related medications, consult a healthcare professional before hard efforts.
• Beta‑blockers and some medications blunt heart rate. Use perceived exertion, pace, or power instead of HR‑based zones.
• Stop exercise and seek medical care if you experience chest pain, unusual shortness of breath, dizziness, or palpitations.

Troubleshooting accuracy

• Spiky or flat readings: tighten the band, move it higher on the wrist, or switch to an arm band or chest strap.
• Cold weather: warm up longer; cold constricts blood vessels and worsens optical accuracy.
• Cadence lock (running): if HR matches stride rate, use a chest strap or enable cadence filtering if available.
• Signal dropouts: replace chest strap battery, rinse the strap after use, and moisten sensors before starting.
• HR lag in intervals: guide reps by effort or pace/power at first; HR will catch up mid‑rep.