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❤️ WHAT IS Win Zone?

Win Zone is a simple training utility for runners, cyclists, walkers, and anyone who plans sessions around heart rate. The app estimates personal fat burn and cardio heart rate ranges using the Karvonen method, then lets you log resting measurements and completed workouts in one journal. Open Win Zone, enter your age and resting heart rate, and see clear bpm ranges you can reference during training.

Every screen is built for quick navigation on your phone, with a dark neon interface that keeps results readable indoors or outdoors. Win Zone does not measure heart rate on its own — you enter values ​​manually from your own reading or device display.

🧮 ZONE CALCULATOR

The Zone Calculator is the core of Win Zone. Enter your age in years and resting heart rate in beats per minute. Win Zone validates inputs (age 10–100, resting HR 40–120 bpm) and applies the Karvonen formula:

• Maximum heart rate = 220 minus your age • Heart rate reserve = max HR minus resting HR • Fat burn zone = 50% to 70% of reserve, plus resting HR • Cardio zone = 70% to 85% of reserve, plus resting HR

Results appear instantly: estimated max heart rate, fat burn bpm range, and cardio bpm range. A colorful zone bar visualizes Rest, Fat Burn, Cardio, and Peak segments across your heart rate span, with marker lines at zone boundaries. Tap Save to Journal to store the result as a resting measurement.

📓 TRAINING JOURNAL

Win Zone keeps a local journal on your device. Browse entries with three filter tabs: All, Resting, and Workouts. Each entry shows date and time, entry type, details, an optional zone snapshot, and optional notes.

Add entries anytime: • Resting measurement — enter resting HR and age; zones are calculated automatically • Workout log — enter duration (1–600 minutes), average heart rate (40–220 bpm), and optional notes

When a workout is saved and a resting measurement exists, Win Zone compares average HR to your latest zones and labels the session as Fat burn zone, Cardio zone, or Other zone. Delete any entry with one tap.

📊 UNDERSTAND YOUR ZONES

Fat burn and cardio ranges are estimates for training guidance, not medical measurements. The fat burn range suits steady aerobic pacing. The cardio range suits stronger aerobic sessions. The zone bar shows where each range sits relative to rest and peak intensity on the visual scale.

The How It Works screen explains the Karvonen calculation step by step in plain English. Win Zone reminds you to consult a doctor before starting a new training program. The app does not replace medical advice or professional coaching.

✨ DESIGNED FOR CLARITY

Win Zone uses a dark theme with cyan, magenta, and amber accents. Glass-style panels, glowing zone colors, and large touch-friendly buttons keep the layout comfortable on small screens. The home screen offers three paths: Calculate Zones, Journal, and How It Works. Every screen includes a Back button for simple navigation.

🏃 WHO IS Win Zone FOR?

• Beginners learning what heart rate zones mean • Joggers and hikers logging resting HR over time • Home workout enthusiasts recording session duration and average pulse • Athletes who already know their average bpm and want a quick zone reference • Anyone who wants a lightweight calculator and journal without extra complexity

📱 KEY FEATURES

✓ Karvonen heart rate zone calculator (fat burn and cardio ranges) ✓ Visual zone bar with Rest, Fat Burn, Cardio, and Peak segments ✓ Save calculator results directly to the journal ✓ Resting measurement entries with automatic zone calculation ✓ Workout entries with duration, average HR, and zone classification ✓ Optional notes on journal entries ✓ Filter journal by All, Resting, or Workouts ✓ Delete entries when needed ✓ Built-in How It Works guide with formula explanation