The squat is typically a barbell exercise where the individual starts in a standing position with the barbell on the back, and bends the knees to squat down until the thighs are parallel with the floor. It has been the subject of some controversy in exercise prescription, primarily related to the belief that it causes knee or low back pain or injury. However, when examining the safety of the squat, it is appropriate to review the history, science, and practical application of this activity