The basic principles of fitness training are summed up in the acronym F.I.T.T
F - Frequency - how often
I - Intensity - how hard
T - Time - how long
T - Type - the type of training (strength, endurance etc.) ...
FITT Principle of Training
The four basic rules of any effective training program...
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Using a time-tested method that can be applied to any fitness program, the FITT principle, you can easily structure a program based on your ability, availability of equipment and your personal schedule. FITT stands for Frequency, Intensity, Time and Type.
Basic Definitions and the FITT Principle
Components of Physical Fitness
Guidelines for Individualized Exercise Prescription
See also: What is the meaning of Fitness, Activity, Exercise, General, Cardiovascular?