How right you are my friend! In my practical life, I have a doctor friend aged about 85+, whenever I went to him for chatting he used to say laughing jokes and started laughing and I also laughed with him it would last about ten to fifteen minutes after that we both got little bit tired then my doctor friend used to tell me that I got my health battery recharged, now I'm feeling much more better than before. It is free of cost, to lead a healthy life and be fresh as you said everyone should flow your writing, I myself realised and benefited from it, you are very very practical in life, a big hug for you. thanks.