Given what we know, we can confirm that the flexibility type that is most beneficial when performed during a cooldown or on a rest day is that of static stretching.
Therefore, we can confirm that given its relaxation effect as well as its efficiency in increasing the range of motion for a muscle, static stretching is the most beneficial type of stretching when performed during a cooldown or on a rest day.
To learn more about muscles visit:
https://brainly.com/question/9883108?referrer=searchResults