International
Found in many different countries.
Body Mass Index
The BMI or Body Mass Index has become a useful tool in managing weight and body fat percentage in the last 20 years. Calculating it requires only simple arithmetic and can be performed by anyone. It's important because it provides an objective measurement that, combined with the appropriate scale for age and body type, helps someone manage their body weight more scientifically.
Basal Metabolic Rate
Most diet and exercise programs focus on what kinds of food to eat, which exercises are best for weight loss and toning, etc. That's sensible, since both diet and exercise are the twin partners that have to be adjusted to maintain a preferred weight range and a healthy body.