T.H.R. is a range of numbers based on percentages of your Maximum Heart Rate (MHR) ranging from sixty percent up to ninety percent. This range is commonly used for people to gauge on how intense they are exercising and if they should increase or decrease the intensity based on their specific goals. One thing to keep in mind, if you are just starting out in an exercise program, it is essential that you start at a lower T.H.R. This will decrease your chances of having any troubles such as respiratory, or cardiovascular. At anytime you feel faint or discomfort, stop immediately and consult with your doctor as soon as you can for a checkup.
 

Enter your age in the form below.
Then press the "Calculate Heart Rate" button to view your target heart rate range.