The keys to selecting the right kinds of exercises for developing and maintaining each of the basic components of fitness are found in these principles:
Specificity
Pick the right kind of activities to affect each component. Strength training results in specific strength changes. Also, train for the specific activity you're interested in. For example, optimal swimming performance is best achieved when the muscles involved in swimming are trained for the movements required. It does not necessarily follow that a good runner is a good swimmer.
Overload
Work hard enough, at levels that are vigorous and long enough to overload your body above its resting level, to bring about improvement.
Regularity
You can't hoard physical fitness. At least three balanced workouts a week are necessary to maintain a desirable level of fitness.
Progression
Increase the intensity, frequency and/or duration of activity over periods of time in order to improve.
Some activities can be used to fulfill more than one of your basic exercise requirements. For example, in addition to increasing cardiorespiratory endurance, running builds muscular endurance in the legs, and swimming develops the arm, shoulder and chest muscles. If you select the proper activities, it is possible to fit parts of your muscular endurance workout into your cardiorespiratory workout and save time.
Source : The President’s Council on Physical Fitness and Sports
The consumer health information on FitSync.com is for informational purposes only and is not a substitute for medical advice or treatment for any medical conditions. You should promptly seek professional medical care if you have any concern about your health, and you should always consult your physician before starting a fitness regimen.