Who said “laughter is the best medicine” first? The best I could find was that it comes from the Bible – Proverbs 17:22 – “A joyful heart is good medicine …” Also, Henry Ward Beecher said, “Mirth is God’s best medicine.”
In any event, it’s good for you as it says below.

Lord knows, he’s right.
Maybe I will do more of the Fitness Funnies now that I know this.
Tony