Final answer:
Frequency, intensity, and time are covered by the FITT principle, which is a guideline to improve physical fitness by structuring exercise through variations in these components.
Step-by-step explanation:
The terms frequency, intensity, and time are covered by the FITT principle. This principle is a guideline for physical activities and stands for Frequency, Intensity, Time, and Type. It's a method used to increase the amount of physical fitness in exercise routines. In other words, you can increase the intensity of workouts, increase the frequency of sessions, or alter the target muscles or systems by changing the type of exercise. Answer (a) FITT principle is the correct choice as it directly involves the concepts of frequency, intensity, and time - the components necessary to design an effective workout program. The other choices: (b) EPOC concept refers to Excess Post-exercise Oxygen Consumption, (c) the SAID principle stands for Specific Adaptations to Imposed Demands, and (d) Overtraining syndrome is a condition caused by excessive exercise without adequate rest.