What is Myzone® and why have we adopted it? The MZ-3 is a heart-rate monitor that delivers real-time feedback on heart rate, calories, and effort allowing you to monitor your exercise and track the improvement in your fitness. It converts all this information into Myzone Effort Points (MEPs), which are displayed live on our studio monitors. You can also track your activity on your phone! It uses heart rate training zones to ensure you’re exercising safely while gauging exactly how much progress you’re making. Our instructors use it to motivate and educate in Core Cycle, Strength, HIIT, TRX, Barre and Zumba classes. Belts are sold at the studio for $99.