Second—Exercise at least a half an hour each day in the gymnasium.
Third—Eat much of simple food; but not too much!
Fourth—Don't worry.
Fifth—Play ball much (base, foot, basket); but not too much!
In a word, be a good animal.
One of my old teachers once said to me after I was engaged in my work:—
"I am sorry to see you looking so well."
"Why?"
"Because every man has to break down three times in life. I broke down three times; Professor Hitchcock broke down three times; every man must break down three times, and the earlier the breaks come, the better."
There is no need of any man's breaking down, if he will observe with fair respect the laws of sleep, exercise and food.