Are you really getting a moderate or intense workout? Here's how to tell.

Looking to amp up your exercise as part of your New Year's resolutions? Determining the intensity of your workouts is a good way to make sure you're getting the level of activity you're aiming for. 

How can you calculate it? It's all about hitting different heart rates, or the the number of times your heart beats per minute.

If you're focusing on moderate exercise, experts say you should be getting to 50% to 70% of your maximum heart rate. Intense or strenuous exercise is about 70% to 85% of your maximum heart rate.