The ischial tuberosity is a bony prominence located at the lower part of the ischium, one of the three bones that make up the pelvis. It serves as an important attachment point for several muscles and ligaments, including the hamstring muscles, which are crucial for movements like running and jumping. This structure is often referred to as the "sit bones" because it bears weight when a person is seated. The ischial tuberosity plays a significant role in maintaining proper posture and stability while sitting, making it essential for everyday activities.