NUTRITION, EXERCISE, AND EATING DISORDERS: PDF OnlyPangrazi Robert P. PhD; Corbin, Charles B. PhDTopics in Clinical Nutrition: June 1999 - p 53-61 Buy Abstract The Physical Activity Pyramid offers a way to depict physical activity prescription, classifying activity into six different types and explaining the prescription for each. Exercise prescription for different types of activity requires knowing how long, how intense, and how often the activity should be done to be beneficial. The Physical Activity Pyramid describes a Frequency, Intensity and Time (FIT) formula for each different type of activity. Guidelines are included for using the Physical Activity Pyramid correctly and safely. © 1999 Aspen Publishers, Inc.