Mi Fit - Mi Fit is a band to monitor your health and fitness level on daily basis.
Garmin Forerunner 935 - A smartwatch for runners ⌚🏃
Gadgetbridge - A free and cloudless replacement for your gadget vendors' closed source Android applications.
TomTom Spark 3 - The Spark 3 is a good fitness tracker for triathletes. It also features a unique and very simple-to-use tracking system. If you're prepared to pay extra, you can get a model with a heart rate monitor and music playback.
WHOOP Strap - The world's most powerful training and recovery tool
Apple Watch Series 3 - Apple's newest internet-connected smartwatch