We should come to know early in life what a large part _good humor_ plays in _physical fitness_.

In previous chapters hearty laughter was extolled as one of the very best of exercises.

It is an organizer in itself and opens up the heart and lungs as nothing else will do.

It makes the blood go galloping all through the system.

It is one of the best automatic _blood circulators_ in the business.
Laughter takes the stress off of the mind, and whatever is ahead of us for the day that seems likely to become a burden is soon turned into an ordinary circumstance.