Best Running Watch For Marathon Training

Garmin Forerunner® 255 Music, GPS Running Smartwatch with Music, Advanced Insights, Long-Lasting Battery, White

Garmin Forerunner 55, GPS Running Watch with Daily Suggested Workouts, Up to 2 weeks of Battery Life, Aqua

Garmin Forerunner 165 Music, Running Smartwatch, Colorful AMOLED Display, Training Metrics and Recovery Insights, Music on Your Wrist, Whitestone

Garmin 010-02120-20 Forerunner 245 Music, GPS Running Smartwatch with Music and Advanced Dynamics, Black

PULIVIA Sports Stopwatch Timer Single Lap Split Digital Stopwatch for Coaches Swimming Running Sport Training Stopwatch, Yellow

Garmin 010-01689-00 Forerunner 35; Easy-to-Use GPS Running Watch, Black

COROS PACE 3 Sport Watch GPS, Lightweight and Comfort, 17 Days Battery Life, Dual-Frequency GPS, Heart Rate, Navigation, Sleep Track, Training Plan, Run, Bike, and Ski (Emerald Green Silicone)

Garmin Forerunner 55 Aqua/42mm Smartwatch Running/GPS/Monitor De Heart Rate

TOOBUR Fitness Tracker No Phone No APP Needed, 1.57" Fitness Watch with Heart Rate/Sleep Tracker/3ATM Waterproof, Smart Watch for Women Men with Pedometer Step Counter Android iOS Compatible

COROS PACE 2 Sport Watch GPS Heart Rate Monitor, 20 Days Long Battery Life, Barometer, Lightweight, Strava, Training Plan, Navigation, Sleep Track, Swim, Bike, Run, Strength, Treadmill (Navy Nylon)