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Norwegian 4x4 Protocol - Download the Norwegian 4x4 App for scientifically-proven HIIT workouts. Transform your fitness with structured interval training. Available on iOS and Android.
Fitbit Blaze - Fitbit Blaze is a smartwatch that includes both a heart rate monitor and a fitness activity tracker. It comes with a color touchscreen, and you can change both the watch's strap and frame. Read more about Fitbit Blaze.
Intervally - Interval Timer - Sport & Health
Fitbit Charge - Activity and sleep tracking wristband
Love HIIT - Free exercise timer, share your workouts
Moto 360 - The round smart watch is finally here.