If you want to keep track of your workout, a sport watch is a great choice. This one is a great choice if you are looking for a lightweight model.
From Amazon
Garmin Forerunner 255 Smaller Easy to Use Lightweight GPS Running Smartwatch, Music Storage, Advanced Training and Recovery Insights, Safety and Tracking Features, Up to 12 days Battery Life, Black
RunningXpert
Garmin Forerunner® 255S Music Black ONESIZE
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