Perhaps you will play tag, or prisoner's base, or stealing sticks, or
town ball. They are all fine fun, and they exercise every muscle in
your body and make your lungs breathe deeper and your heart beat
faster, and make every part of you grow stronger.

[Illustration: BETTER TO TAKE THAN MEDICINE]

Perhaps you have a few chores to do or errands to run; but even these
are almost as much fun as play and give you good exercise in the open
air and, what is better still, a feeling that you are being of some
use in the world, which is one of the happiest and most satisfactory
feelings that you will ever have, if you live to be a hundred years
old.

[Illustration: OUT FOR AN AFTERNOON IN THE PARK]

But when you have finished your work, you must not forget to play
real, lively, jolly games out of doors--ball and tag and
hide-and-seek, and all those games that children love.

Hide-and-seek is a good game, because, when you are caught, you can
stand still a few minutes and rest. When you are hiding, you can take
a good breath for the home-run you have to make. Most games, in fact,
are planned like this--a run and a rest, and then another run. While
you rest, some one else is taking his turn at the bat, or at being
"It," or whatever is the hardest part of the work. This is one reason
why games are so good for you to play.

You see, when you run, you are working your muscles and heart-pump