Final answer:
The option that meets the recommended guidelines for flexibility training is regular stretching exercises, as they specifically target the muscles and joints to increase flexibility and reduce the risk of injury.
Step-by-step explanation:
Among the options provided, regular stretching exercises would meet the recommended guidelines for flexibility training. Flexibility exercise includes any physical activity that stretches and lengthens muscles, which in turn improves the range of motion and reduces the risk of injury. Examples of flexibility exercises include stretching, yoga, and tai chi.
Other forms of exercise, such as aerobic exercises (like cycling, walking, and running), enhance muscular endurance and cardiovascular health, but they do not focus specifically on flexibility. Anaerobic exercises, like weightlifting and sprinting, are designed to increase muscle strength; while they may involve some flexibility components, they are not considered flexibility exercises in the same way that dedicated stretching or yoga would be.
Therefore, engaging in regular stretching exercises is the most effective way to increase flexibility according to the recommended guidelines for flexibility training.