A must for the individual seeking complete guidance and feedback. The OwnIndexT fitness test will determine your fitness level within 5 minutes, while you sit and relax, a great tool for tracking your fitness improvements. OwnCalT counts the calories and fat that you burn based on your effort level, not the treadmill's. And OwnZoneT Advanced takes the guess work out of finding your personalized target zones. The M61 will determine 1 of 3 preset target zones based on how your body feels for that specific day. The M61 is truly the smart HRM.