Adults should perform flexibility exercises at least two to three times per week to maintain adequate joint range of motion and prevent stiffness. Stretching can enhance overall performance, improve posture, and reduce the risk of injury, especially as individuals age. Incorporating flexibility training into regular fitness routines can aid recovery post-exercise and promote relaxation. Ideally, flexibility exercises should be part of a comprehensive fitness program, alongside aerobic and strength training, to optimize overall health and functionality.