PROTREK O2O vs SUB. Marathon Pace & Training

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[Stop training blind. Let the data define your peak.] SUB is the marathon training partner built for Garmin and COROS runners. Connect your watch once and every run syncs automatically. Pick a goal — Sub-3, Sub-3:30, Sub-4 — and SUB turns it into per-kilometre target pace, the right races, and coach workouts that tick themselves off the moment your watch syncs. Free. No subscription. No ads. Whether you're chasing your first 5K or a sub-3 marathon, SUB plans your next race with science, not guesswork. CORE FEATURES 1. Connect once, then it's automatic • Garmin — every Forerunner, Fenix, Epix and Venu; runs land within minutes • COROS — Pace 3, Apex 2 / 2 Pro, Vertix 2, with full running dynamics and lap detail • Apple Watch (via Apple Health) and Polar • Use Garmin and COROS together — mileage is de-duplicated, never double-counted 2. Goal-driven pacing • Pick Sub-3 / Sub-3:30 / Sub-4 and get target pace per km or mile, plus 5K, 10K, half and 30K splits • Pace calculator for any distance and finish time, with a track mode for lap splits 3. Running Fitness engine • Elite-grade model: Daniels–Gilbert. Enter a recent result and unlock your fitness level • Five scientific training paces — E, M, T, I, R — no more guessing at effort • Race predictions from 5K to the marathon to shape your SUB strategy 4. Coaches and clubs • Coaches assign long runs, intervals and tempo; they auto-complete when a matching run syncs — no manual logging • Coached classes and running clubs across Hong Kong 5. Race intelligence • Races in Hong Kong, Japan and worldwide: dates, venues, distances, entry windows • Save races with one tap; countdowns live on your Home Screen widget 6. Built for Hong Kong runners • Live sports ground availability — opening slots and bookings for every public track • Real-time running weather • Monthly challenges with live rankings Also: Apple Watch app, weekly / monthly mileage widgets, leaderboards, English / Traditional Chinese / Japanese. WHY SUB? Because running isn't magic — it's oxygen engineering. Garmin Connect and COROS Training Hub log your runs; SUB turns that data into a goal, a pace and a plan, so you can put your energy on the road. Download SUB free. Never miss a race — or a chance to get stronger.