Wii Sports Wiki

The Body Test in Wii Fit is a short and simple set of activities used to gauge your body's performance. After choosing a Mii™ - a virtual caricature unique to Wii - to represent you, use the Wii Balance Board to measure your center of balance, Body Mass Index (BMI), and body control. Based on these results, you can also determine your Wii Fit Age. The whole family can engage in the Body Test and compare their progress together!

While the Mii is taking the Body Test, sometimes the Wii Fit Board will ask you to close your eyes. It suggests you can also hold an extra item the next time. When your Wii Fit Age is very different from your real age, you may be told to improve your skills or that you have much time to improve!


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Your Body Test will begin simply by checking your center of balance. After stepping onto the Wii Balance Board accessory™ with your feet spread equally apart, Wii Fit will check the balance of your posture and your BMI. Once the measurement is complete, you will be able to see where your center of balance is located and what your BMI is currently. If it is your first day, then you have to do a practice.


Your BMI, or Body Mass Index, is determined in Wii Fit by a formula comparing your weight and height. You'll even be asked for variables such as the weight of your clothes, so Wii Fit can provide you with an accurate measurement. Once your BMI is displayed, you'll have the option of seeing your weight as well, but that's completely up to you. In fact, you can even protect your information from other users with a private PIN number.

The body mass index (BMI), or Quetelet index, is a controversial statistical measurement which compares a person's weight and height. Though it does not actually measure the percentage of body fat, it may be a useful tool to estimate a healthy body weight based on how tall a person is. Due to its ease of measurement and calculation, it is the most widely used diagnostic tool to identify weight problems within a population, usually whether individuals are underweight, overweight or obese. It was invented between 1830 and 1850 by the Belgian polymath Adolphe Quetelet during the course of developing "social physics".[1] Body mass index is defined as the individual's body weight divided by the square of his or her height. The formulae universally used in medicine produce a unit of measure of kg/m2. BMI can also be determined using a BMI chart, which displays BMI as a function of weight (horizontal axis) and height (vertical axis) using contour lines for different values of BMI or colours for different BMI categories.


For players under 20 years of age: The BMI assessment in Wii Fit is designed for adults, not for players between ages 3 and 19. However, players ages 3 – 19 can get a BMI measurement for informational use only.

Body Control

After discovering your BMI, you'll then test your body control. Wii Fit measures your body control by using two randomly selected balance tests. Perform the tests by following the simple on-screen instructions and giving it your best shot. After completing these tests, you'll be given your Wii Fit Age. Tests include walking, basic balance, one leg, and agility.

Wii Fit Age

Wii Fit Age is a number used in Wii Fit that determines how fit you are, in terms of years.

Your Wii Fit Age will be calculated based on your balance-test results, taking into consideration your actual age. Keep in mind: Your Wii Fit Age is only a measurement of your current performance, so if you're unhappy with it, you'll have another opportunity to improve it the next time you play.

Track Progress

Once you've completed the Body Test, you can Stamp the Calendar, so you can keep track of your activity. During your first and subsequent Body Tests, you'll be asked if you'd like to set a BMI goal for some point in the future which can be customized to fit your schedule. Check out the What is Wii Fit? section for more details on charting your progress.


  • When the user is under 18, "At Risk Of Overweight" and "Overweight" are used in place of "Overweight" and "Obese". It will also say “Healthy Weight” instead of “Normal”. “Underweight” doesn’t change.