The primary effect of yoga on flexibility is to enhance the range of motion in joints and muscles. Through various postures and stretches, yoga promotes the lengthening of muscle fibers and increases blood flow to tissues, which helps in alleviating tightness. Regular practice also helps in balancing the muscle groups involved in movement, leading to improved stability. Additionally, the focus on controlled breathing facilitates better stretching and alignment, further enhancing flexibility. These benefits can prevent injuries and contribute to overall physical well-being.