4x4 Treadmill vs Meridian

4×4 Treadmill is your personal interval training coach. Built around the scientifically proven Norwegian 4×4 method, it guides you through high-intensity treadmill workouts with real-time heart rate monitoring and live coaching. WHAT IS 4×4 TRAINING? Four intervals of 4 minutes at high intensity, separated by active recovery periods. This protocol is one of the most effective ways to improve cardiovascular fitness and VO₂max. FEATURES • Real-time heart rate monitoring via Bluetooth sensor or Apple Watch • Live coaching — tells you to pick up pace or slow down based on your heart rate zone • Execution Score (0–100) based on intensity, consistency, and recovery • Detailed post-workout analytics with heart rate charts and per-interval breakdown • VO₂max estimation after each session • Customizable warmup, interval, recovery, and cooldown durations • Treadmill speed and incline settings per stage • Full workout history with day, week, month, and year views • Supports English and Norwegian HOW IT WORKS 1. Connect your heart rate sensor and set your target zones 2. Start the guided workout, the app coaches you through warmup, four hard intervals with recovery, and cooldown 3. Review your Execution Score, heart rate chart, and per-interval breakdown Start training smarter today.

Meridian is the fasting app for people who are tired of fasting apps. No 15-screen onboarding quiz. No AI coach upselling you a meal plan. No gamification badges. No paywall on the timer. Just a clean, powerful tool that respects your intelligence and your time. START IN SECONDS One tap to start. One tap to stop. Meridian tracks your fasting window, shows what's happening in your body at each metabolic phase, and stays out of your way. Every schedule built in — 14:10, 16:8, 18:6, 20:4, OMAD, or set your own custom window. REAL SCIENCE, NOT SLOGANS Each body phase is grounded in peer-reviewed metabolic research. Know when glycogen depletes. Know when ketosis begins. Know when autophagy ramps up. Meridian tells you what's actually happening — with citations, not marketing copy. YOUR DATA STAYS ON YOUR DEVICE No account required. No cloud sync you didn't ask for. No analytics tracking your behavior. All data lives on your iPhone and stays there. Optional Apple Health integration reads and writes only with your explicit permission. DESIGNED WITH INTENTION Every screen earns its place. Meridian follows a less-but-better philosophy — no feature creep, no settings bloat, no dark patterns. Dark mode and light mode. Clean typography. A timer that's beautiful enough to leave on your nightstand. BUILT-IN SCHEDULES • 14:10 — Gentle start for beginners • 16:8 — The most popular protocol • 18:6 — Deeper metabolic benefits • 20:4 — The Warrior approach • OMAD — One Meal A Day • Custom — Set any window you want MERIDIAN PREMIUM Unlock deeper insights and advanced features for less than a coffee: • Detailed fasting history and trends • Body phase insights with metabolic data • Advanced streak tracking • Custom schedule presets • Full data export $1.99/month · $14.99/year (save 37%) · $39.99 lifetime No free trial. No tricks. At this price, you'll know within a day if Meridian is for you. Privacy policy: https://trymeridian.today/privacy-policy Terms Of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Support: https://trymeridian.today/support