3
POPSWeightlifting and Body Mass Index One of the ways that medical professionals determine if you are overweight is by a rating called body mass index. BMI is an approximate measure of body fat based on weight and height proportion. BMI was designed to get an approximation or snapshot of body fat - it can over estimate Body fat in those with a lot of lean muscle mass, like weightlifters. BMI is calculated by taking your weight in pounds, multiplying by 703 and dividing that number by your height in inches squared. Compare the results as follows: