There are four basic components in all physical fitness programs. These are frequency of exercise, intensity of the exercise, time spent exercising, and the type of activity. Each factor is essential in planning your exercise routines and will influence the extent of your training results. Therefore, to optimize training time, recommendations have been set for the different types of training (i.e., cardiorespiratory (heart and lung) and muscle fitness). These are outlined in the Physical Activity Pyramid in Figure 4-2 and are called the FITT Principle guidelines.
FITT = Frequency, Intensity, Time & Type
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