What are the factors that should be considered in designing personal fitness program?

The FITTE principle is a great acronym to keep in mind when designing any type of exercise program, whether it is cardio, strength, and/or flexibility. The letters stand for the following:
Frequency: the number of activity sessions each weekIntensity: how high of a demand the activity will beTime: how long the activity session will beType: the mode of activity (walking, dancing, lifting weights, yoga, etc.)Enjoyment: it is certainly best to plan for activities that you enjoy!Many of these factors (such as frequency and intensity) will be dependent upon your individual goals, and may change over periods of time.