Should I follow the FITT principle for exercise?

Yes the FITT principle which stands for Frequency, Intensity, Type, and Time, should dictate your planning for all workouts you perform. By manipulating how many days a week you work out, how hard, what types of workouts you perform and for how long, you can improve fitness and decrease the risk of over training. If you perform the exact same workout,  at the same intensity for the same of length of time, the same days of the week, this will lead to boredom, over training, lack of progress and possibly injury.  Always strive for variety in your programs to decrease the risk of injury, and boredom, and to continue to see improvements. 
Starting -- or revitalizing -- an exercise program can feel like a big task. First, start where you are most comfortable. Select exercises in consultation with your physician that you enjoy and that are appropriate given your health history. Then use the acronym FITT for an easy way to remember how to continually adjust your exercise to improve your fitness. By slightly altering the Frequency, Intensity, Time (duration), and Type of exercise you do, as you are able, you will be on your way to getting fit!

I might be missing something but there used to be an "E" at the end making it F.I.T.T.E. and the E meant enjoyment.

Frequency, Intensity, Type and Time are all important but so is enjoyment.  If you do not enjoy the exercise you are doing then the changes of you maintaining the consistency also diminishes.  Make sure to focus on the enjoyment of the exercise because that is one of the keys for motivation.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.