
Norwegian 4x4 Protocol
Intervally - Interval Timer
Love HIIT
HIIT (Watch)
HIIT Interval Buddy
Workout Time!
Interval Timer (PFA)
Just Another Workout Timer
React Engine
The Norwegian 4x4 Protocol is a cutting-edge approach to exercise that can significantly boost your cardiovascular health and stamina. It consists of four intense four-minute intervals at 90-95% of your maximum heart rate, each followed by a three-minute recovery period. This scientifically backed method is renowned for its efficiency in improving VO2 max and overall endurance.
Norwegian 4x4 Protocol
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Intervally - Interval Timer - Sport & Health
Love HIIT - Free exercise timer, share your workouts
HIIT (Watch) - A very simple interval timer engineered for Apple Watch
HIIT Interval Buddy - Let Interval Buddy help you with your high intensity interval training - a popular method of high-impact cardio fitness training that reduces time spent in the gym and makes cardio training less of a bore.
Workout Time! - An app for managing and performing timed workouts.
Interval Timer (PFA) - Privacy Friendly Interval Timer supports the user during his/her circuit training session and helps him achieve his/her training goals.