Final answer:
Flexibility exercise involves activities like yoga and stretching that improve joint flexibility and muscle range of motion. The purpose is to reduce injury risk, with training ideally done two to three times a week for lasting benefits.
Step-by-step explanation:
Flexibility exercise is any physical activity that involves stretching and lengthening muscles to improve joint flexibility, maintain muscle limberness, and enhance the overall range of motion. The purpose of flexibility training is to reduce the risk of injury and to aid in athletic performance. Regular flexibility exercises such as yoga and stretching can lead to both immediate and long-term benefits, though the duration and frequency can vary depending on individual fitness goals and needs. Ideally, flexibility training should be included in a fitness routine at least two to three times a week, holding each stretch for about 15 to 60 seconds and repeating for multiple sets for optimal benefits.