The Garmin Bounce 2 Guide names it for kids and family.Kids and family: Calls, texts and live location let a child stay in touch with parents without a smartphone. Source linkedSource
The Garmin Forerunner 170 Guide names it for running and sleep.Running: Garmin Coach plans adapt to your recovery each day, and GPS felt spot on for runs up to 10K. Source linkedSourceSleep: Each night brings a sleep score, a sleep coach and HRV status to show how well you recovered, on a watch that weighs 41 grams. Source linkedSource
From what each Guide names the product best for. Both Guides also name fitness.