Hi, I'm Wendy Russo and I'm going to explain how your fitness level affects your heart rate during exercise and at rest. Your heart rate is a key factor in determining your personal level of fitness. When working out at a fitness center usually on the treadmill there's a heart rate zone chart but if you don't have that you have to determine your heart rate zone by taking 220 and subtracting your age. This gives you your maximum heart rate. Ultimately you should work between 65 and 85 percent of that maximum heart rate to be within your fitness level zone. While working on the treadmill there are a lot of ways to monitor your heart rate. You can use the sensors that are on the treadmill or you could use a heart rate monitor strap that will send a signal to this treadmill and your heart rate will constantly show on the display. These are some of the best ways to monitor your heart rate. Now your heart rate at rest can only be taken in the morning when you getup first thing. That would be your resting heart rate but way different than your fitness level heart rate which should always be higher when you're active throughout the day.