Final answer:
The Principle of Overload is the flexibility training principle that encompasses increasing the frequency, intensity, and time of stretching sessions to improve flexibility and reduce the risk of injury.
Step-by-step explanation:
The principle for flexibility training that states increasing frequency (sessions per day or week), intensity (point of stretch), and/or time for each session is the Principle of Overload. This principle suggests that in order to improve flexibility, a person must gradually increase the demands on the body. Increasing the frequency of stretching sessions, the intensity of stretches to the point of feeling tight but not to the point of pain, and the duration of each stretching session can help to improve flexibility over time. Just as in strength training, where the load must become increasingly heavier, flexibility exercises also must become gradually more challenging to see improvements.
Moreover, flexibility exercise is not only about stretching but ensuring overall joint flexibility and keeping muscles limber which can ultimately reduce the risk of injury. Regular flexibility exercises, such as stretching, yoga, or tai chi, can have a wide range of benefits for physical, mental, and emotional health. It is essential to perform these exercises with proper technique to minimize the risk of overuse injuries and to allow adequate recovery time between sessions for muscle repair and growth.