Waist circumference is a measurement taken around the narrowest part of the torso, typically just above the belly button. It is an important indicator of body fat distribution and can help assess the risk of health issues such as heart disease and diabetes. To measure waist circumference, a flexible measuring tape is placed around the waist, ensuring it is snug but not compressing the skin. This measurement is often used alongside other metrics, like body mass index (BMI), to provide a more comprehensive view of an individual's health.