Garmin Forerunner 45S GPS watch

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 and night.

See your body's energy levels throughout the day so you can find the best times for activity and rest.

The Pulse Ox sensor1 gauges your blood oxygen saturation during the day and as you sleep to show how well your body is absorbing oxygen.

Find out if you're having a calm, balanced or stressful day. Relax reminders will even prompt you to do a short breathing activity when you're feeling stressed.

Use the Garmin Connect™ app to track your cycle, log physical and emotional symptoms and learn about training and nutrition during each phase of your cycle.

Log your daily fluid intake as a reminder to stay hydrated. You can even have an auto goal for hydration that adjusts based on how much sweat you lose during activities.

See how you're breathing throughout the day, during sleep and during breathwork and yoga activities.

Get a full picture of how you're sleeping, with a breakdown of your light, deep and REM sleep stages as well as Pulse Ox1 and respiration data.

The watch constantly samples your heart rate2 and will alert you if it stays high while you're at rest. It also helps gauge how hard you work during activities — even underwater.

When you want to relax or focus, you can start a breathwork activity, and this watch will track your stress and respiration to help you get a better understanding of how you're breathing.

Easy-to-follow, animated cardio, strength, yoga and Pilates workouts come preloaded on the watch, and you can download more from the Garmin Connect app.