Weight management - how to retain your weight in the normal level.
Overweight - too much weight. Obesity.

BMI - Body Mass Index. This is used to measure your body fat based on your weight and height. This will tell you if you are having normal weight in your current height.

Waist circumference - the size of your waist. Can be measured using tape measure.

Physical activity - involves physical movements like running, walking. Using your body to work.

Exercise - This is needed to have a good health. This also helps maintain good weight and the build of the body.