Hello readers! I’m pleased to announce a new addition to the site, the Interval Calculator.

As you may know by now, there are many different ways to monitor your HIIT intervals, but none better than by heart rate.

HIIT relies on alternating between 90%+ max heart rate and ~60% max heart rate to be effective. The HIIT Interval Calculator will allow you to input your age and see exactly what heart rate you should be hitting on your HI intervals and your Active Rest intervals.

Give it a try, its free!

*Disclaimer: Training in your upper ranges of maximum heart rate can be stressful on your heart. Please consult a physician before attempting HIIT. Results of calculator are a guide only.