Heather O. Chambliss PhD FACSM


Moderate-Intensity Aerobic Activity

Aerobic fitness means increasing how well the body uses oxygen, which depends on the condition of the heart, lungs, and muscles. Experts tend to describe aerobic activity in three ways: light, moderate, and vigorous. When people do moderate-intensity activities, they notice a faster heartbeat. To get the benefits of…

Rating of Perceived Exertion (RPE)

Rating of perceived exertion (RPE) can help you measure how hard your body is working when you exercise. Using a scale from 6 to 20, you choose a rating number to describe how hard the activity feels. You base the number on how tired you are, how hard it is to breathe, and how hard it is to do the activity. For most…

Vigorous-Intensity Aerobic Activity

Aerobic fitness means increasing how well the body uses oxygen, which depends on the condition of the heart, lungs, and muscles. Experts tend to describe aerobic activity in three ways: light, moderate, and vigorous. When people do vigorous-intensity activities, they breathe faster and have a much faster heartbeat than…

Muscle Fitness

Muscle fitness means having muscles that can lift heavier objects or muscles that will work longer before becoming exhausted. Muscle fitness improves when a person does activities that build or maintain muscles (strength) or that increase how long a person can use his or her muscles (endurance). Activities like weight…

Healthy Muscles

Muscle fitness is one of three important types of overall physical fitness. The others are aerobic fitness and flexibility. When you increase your muscle fitness, you’ll notice that you can carry heavy grocery bags more easily, pick up children without feeling as much strain, or carry heavy items longer before you get…