Ever since boyhood I've made a religion of keeping in shape by regular, conscientious exercise.
I did six years of planning to win the championship from Jack Dempsey.
A boxer must exercise and develop every part of his body.
To enjoy the glow of good health, you must exercise.
Exercise should be regarded as tribute to the heart.
But I do say that, if you will regularly devote 15 minutes a day, preferably before breakfast, for 60 days to the simple set of exercises that I devised for conditioning men in the navy, I guarantee that you will enjoy increased physical buoyancy and mental vigor.