A Running Watch That Won't Weigh You Down Forerunner 45S is the smaller-sized GPS running watch with all the running-related features you need in a sleek, lightweight smartwatch you’ll want to wear all day & night. Monitors heart rate at the wrist, because a finger on the pulse is so old school. For concrete proof that you crushed it, GPS tracks pace, distance, intervals & more. Get yourself on the road to glory with free Garmin Coach adaptive training plans. Say goodbye to missed texts with smart notifications delivered right to your wrist. We’ve got your back with built-in incident detection & assistance features. Log more miles between charges with up to 7 days of battery life. Designed For Runners Run far with a smaller-sized lightweight watch that fits comfortably & won't hold you back. Light & Sporty Materials The sweat-ready silicone band makes chafing a thing of the past.