Body fat percentages for different athletes can be seen with this link at the bottom of their page. 
  
   Here are some links to other pretty good body fat percentage information:
   What does your body fat percentage mean ?
   Ways of measuring body fat.   
   More on bioelectrical Impedance and how it works (They even show a fake device). 

   A few primary ways our bodies accumulate to much fat ?
   1)  To many calories at the wrong time - If you eat certain calories and don't burn them, then the calories that are left get stored as fat. . 
   2)  Low metabolism - Some people have low metabolism from heredity, illness or being sedentary. As we gain weight our metabolism slows down. .
   3)  Inactivity - THIS IS THE BIG ONE ! An example of this is eating and going to sleep !
   We need calories. Healthy calories come from the right carbohydrates, protein and  good fat.

     (see good carbs vs. bad carbs) .
      (see good fat vs. bad fat) 

        Nutrient calories:
      Fat: 1 gram = 9 Calories.
      Protein: 1 gram = 4 Calories.
      Carbohydrates: 1 gram = 4 Calories.  

   If you wonder how much is in a gram, then you have to understand that a gram of sugar looks different than a gram of potato chips.          

  How soon after we eat is food ready to be used ? (This link is just one opinion, but a good one )   
  From the above link, you can see that digestion is a very complicated subject for our individual body science. Our digestion is influenced by the different foods we eat daily, our metabolism, energy level, some heredity and more !  I believe if you keep track of what you eat, your daily (not weekly) weight , body fat, lifestyle issues & factors (health, stress, working overtime, etc) and the exercise that you do, soon you will see patterns that will help you get at least an idea of  how and when your body science digests foods, and how exercise and your lifestyle may influence your body composition.. 

 The body fat we do need is called "essential body fat". Here are some places this body fat resides and how it functions:
   1) Found in the brain, central nervous system and bone marrow.
   2) Woman's breast are made up of fat.
   3) Protects and insulates our organs.
   4)  Helps control our body temperature.
   5)  Is the main form of the bodies energy storage (we would not function properly without it). It is like energy stored for use at another time. 
 
  How do you handle eating and burning body fat at an even rate ?
(Google this search = "burning body fat at an even rate") 
  This question requires some fairly complicated answers. To start with, you must understand that your body science dictates how you burn fat. Your metabolism and how your body processes food. Then, you can factor in external factors like, your energy expenditure, how much you eat, when, and what are the primary factors involved. Your digestion, how well you absorb nutrients and how your body circulates and processes them are other factors. 
  The real answer to the question of "how to handle burning body fat and eating" lies in experimentation. If you get bored writing things down everyday, then you are plain out of luck. You have to keep daily track of  some or all of these factors so that you can see patterns over time. Our software is intended for just that. You may even want to track your moods, health, overtime at work, daily family commitments and activities, etc as these affect exercise.
  So, if you don't want to get that deeply involved in finding out the answer to our question of eating and burning body fat at an even rate, then the general way is:

        1) cut back on bad calories (see good carbs vs. bad carbs) .
        2) don't eat junk.
        3) don't eat bad fats.   (see good fat vs. bad fat) 
        4) exercise. (I like most of the information here on fat burning exercises). 
        5) Eat foods that positively affect your metabolism. (Foods that affect your metabolism) 
        6) Cut down on stress.
        7) Get the proper amount of rest. 

       And, if you research these seven points on the internet you will find hundreds of ways to combine these, of which even combinations of combinations will help !  
         It comes down to trial and error my friend ! Anybody who says they have the answer only has part of it, the other part is your unique body science.
        So start with the experts. The USDA My Pyramid Tracker is a good place to learn about eating properly and safely.  
        The American College of Sports Medicine and/or the American Council on Exercise are two places that can tell you about exercising properly and safely.

  What burns fat more, Cardio or Strength training ?   
  Well, I have to say  neither one, yet. First, you have to see which one burns more body fat for your body science. With that, we suggest both. Not just to see which one burns fat, but more importantly, you need both (here is a good article) for your body ANYWAY for reasons other than burning fat. So, if Cardio and Strength training burns fat in some capacity, you cannot loose by using both. One of the best way to combine both is circuit training at a moderate to intense level.  
  This link says cardio burns more fat than strength  training. It is interesting and has good points.
  This link says that strength training burns more fat than cardio, it also has interesting points.
  This link explains how strength training benefits the weight loss process.
  This last link explains how cardio burns fat, also interesting. 

  You can see that opinions about both have some good and valid points. Since that's true, then I would have to say that these programs worked for the body science of the people who wrote  them. So, again, you see that it is how your body science handles them. For my body, I lean towards cardio for burning fat quickly and strength training for burning fat over the long run..

  So, Body Composition is one of the four major factors (Strength, Cardio, Flexibility and Body Composition) that determine the fitness level of your body science.

More research on Body Composition will be available soon !