• Muscle Endurance:  Being able to use your muscles  
    for a long period of time. 

    Muscle Strength:  How strong your muscles are at  
    different events. 

    Flexibility:  Keeping your muscles stretched to stop  
    from getting hurt. 

    Aerobic Endurance:  Being able to exercise for long  
    periods of time without running out of breath. 

    Body Composition:  How much muscle you have compared  
    to how much fat you have. 

    Aerobic Exercise:  Aerobic exercise helps make the heart and lungs  
    stronger by increasing the oxygen available to the body and by enabling  
    the heart to use oxygen better.  It uses the same large muscle group, rhythmically,  
    for a period of 15 to 20 minutes or longer while maintaining 60-80% of  
    your maximum heart rate.  Aerobic activities include: walking, biking,  
    jogging, swimming, aerobic classes and cross-country skiing.

    Anaerobic Exercise:  Anaerobic activity is short in time but high in effort.  
    Anaerobic activities include: racquetball, downhill skiing, weight lifting,  
    sprinting, softball, soccer, and football.

    Ectomorph:  This body type is characterized by a light  
    build and slight muscular development. Ectomorphs 
    may even have trouble gaining weight and feel they are too thin.  
    As with other body types, people who fall into this category should exercise,  
    but will have a different focus. Because they are often trying to gain weight,  
    an ectomorph might spend more time on  
    strength training and a bit less time on cardio work. (1) 

    Endomorph:  This body type is characterized by a stocky  
    build, wide hips, and the annoying tendency to easily store  
    body fat. Endomorphs may also have more internal fat around  
    the organs, which makes fat loss more difficult than other  
    body types. People with this body type will want to pay  
    close attention to their diets and make sure to follow a  
    complete exercise program that includes cardio and  
    strength training. (2) 

    Mesomorph:  This body type tends to be more muscular, with  
    a large chest and a long torso. A person with this body type  
    may find it a little easier to build muscle than others.  (3) 

    (1) By Paige Waehner, About.com  
    (2) By Paige Waehner, About.com  
    (3) By Paige Waehner, About.com