Body Mass Index is the way to determine whether the person has healthy weight for his height. Body Mass Index for a person can be calculated by dividing his weight in kilograms by square of his height in meters. Body Mass Index helps us to identify whether a person is under weight, over weight, obese or normal. If Body Mass Index is between 20 to 25 then the person has normal weight. If Body Mass Index is less than 20 then the person is under weight and if it is more than 25 then the person is overweight. If Body Mass Index is more than 30 then the person is obese. Therefore Body Mass Index helps us to determine the state of our health and fitness.

If a person is over weight or obese then it can cause serious health problems like heart attack, Blood Pressure, Diabetes etc. Body Mass index may not be good health and fitness indicator always. If a person has lean muscle then his Body Mass Index will be more which indicates that he is over weight. Therefore Body Mass Index will not help athletes and body builders. They need to follow different technique to determine their fitness.