ZoneFit: HR Zone Training

Custom HR zones from your personal baseline. Real-time Apple Watch alerts keep you in the fat-burn zone. Easy, time-smart, no wasted workouts — every minute counts.

Out of a 30-minute workout, less than 15 minutes delivers real fat-burning results.

Sound familiar? ▸ Stuck working out for weeks with zero change to weight or body fat ▸ Running blind — either totally drained or barely working up a sweat ▸ Unsure how much to train weekly: wasted effort vs. burnout risk ▸ Pushing through hard workouts on poor rest, feeling worse over time

Harder doesn’t mean more effective. The right heart rate zone is what matters. Stay steady in a zone built for your body to burn fat efficiently, no burnout, no wasted time.

ZoneFit helps you make every workout minute count:

PERSONALIZED HEART RATE ZONES

Generic one-size-fits-all formulas don’t fit your body. ZoneFit uses the Karvonen formula to build 3 custom training zones from your physiological baseline (age + resting heart rate): ▸ Z1 Recovery — Low-intensity cardio to ease daily fatigue and improve sleep ▸ Z2 Fat-Burn — Golden sweet spot. Steady calorie burn with no strain, ideal for daily training ▸ Z3 Endurance — Boosts cardio stamina, breaks plateaus, and keeps you energized daily

STAY ON-TARGET WITH APPLE WATCH

Three real-time cues keep you in the zone during every workout: ▸ Color-coded screen — Blue = too low, green = on target, pink = too high. Tell at a glance ▸ Voice alerts — Automatic "speed up" / "slow down" prompts when you drift out of range ▸ Dual vibration — Two quick pulses the moment you enter the target zone

ONLY EFFECTIVE TIME COUNTS

The timer pauses when your heart rate drops out of the zone, and resumes only when you’re back. Hit goals with real effective time, not filler minutes. The watch app runs fully standalone — leave your phone at home. Data syncs automatically to your iPhone post-workout.

CHECK DAILY READINESS FIRST

Using resting heart rate, HRV and sleep data, ZoneFit gives a daily fitness score and tailored recommendation: ▸ High readiness → Z2 Fat-Burn: 30min brisk walk/jog, steady fat-burning heart rate ▸ Tired from work → Z1 Recovery: Gentle low-intensity relief, no extra body strain ▸ Well-rested → Z3 Endurance: Steady cardio gains, no unnecessary overexertion ▸ Poor recovery → Rest or scale back. Train with your body, not against it, to avoid injury

4-DIMENSION WORKOUT SCORE

Beyond duration and calories, get a personalized score across 4 key metrics: ▸ Zone time percentage — Time spent in target zone; no self-satisfaction from total minutes ▸ Duration completion — Effective time hitting targets drives real physical progress ▸ Zone stability — Steadier heart rate = higher per-minute training efficiency ▸ Load appropriateness — The right intensity: not too light, not too draining No more guessing from raw data — every score comes with clear improvement guidance.

BUILD LONG-TERM SUSTAINABLE HABITS

Built on ACSM guidelines for a lasting, healthy routine: ▸ 150 minutes of moderate exercise weekly — follow along and hit the standard ▸ 5 progressive fitness challenges, beginner to advanced, with clear steady progression ▸ Track long-term trends across 6 core physiological metrics

ON-DEVICE DATA, ZERO SERVER UPLOADS

All health data is processed locally on your device, never uploaded to any server. Training records sync automatically to Apple Health — you stay in full control.

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