waist

The waist is the part of the human torso between the rib cage and the hips. In common usage it refers to the narrowest part of the trunk, though its exact position varies with anatomy and fat distribution. The waist serves as a general reference point in anatomy, medicine, and clothing.

Anatomically, the waist lies at the junction of the thorax and pelvis. It is supported by abdominal muscles, including the obliques and transversus abdominis, and is bounded above by the lower ribs and below by the iliac crests. The area contains or lies near abdominal organs and surrounding soft tissue.

Measurements and health: Clinically and in fitness contexts, waist circumference is measured around the abdomen at roughly the natural waist or the level of the navel. The waist–hip ratio compares waist circumference with hip circumference. Larger waist measurements can indicate central or visceral fat, which is linked with higher risk of metabolic and cardiovascular diseases, though risk depends on age, sex, and other factors.

Clothing and fashion: In garment construction, the waist serves as a primary measurement for fit and silhouette. Garments may use a natural waist, a high waist, or a low waist design, affecting how a garment sits on the body and how it accommodates movement.