Importance of Stretching

I was at my parents house tonight and my dad (age 56) was walking around all stiff and sore from working out. I told him he needed to stretch to loosen him up a bit, and my mom informed me that he does not believe in stretching. Does anyone have any good articles on the importance of stretching I can share with him? I know it will be so good for him, especially as he gets older too!

Thanks!

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