The Sit and Reach Test is a common flexibility assessment used to measure the flexibility of the lower back and hamstring muscles. Participants sit on the floor with their legs extended straight ahead and feet against a box or measuring device. They then reach forward as far as possible, holding the position for a moment to record the distance reached. This test is often included in physical fitness assessments and is a simple way to evaluate overall flexibility. It is particularly useful for athletes and individuals looking to improve their physical performance or prevent injuries related to tight muscles.