You should hold a stretch for as long as it does not become too painful for you. Stretch as much as your body needs but not too much because, it could tear up your muscles and tendons. This is the best answer i could give you.
Answer:sushi love shi
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Answer:
6 through 17 years do 60 minutes daily
Explanation: If you mean work out wise I have no clue but youth should at least walk around for a bit every day.
The term that best describes the extending and flexing of muscle joints would be a muscle contraction. In addition, this specific form of body movement mainly emphasises the production of muscle tension in the muscle fibres when we do strenuous activities like weights and exercise.