In The Happiness Advantage, I challenge readers to do one brief positive exercise every day for 21 days.

CNN: Is happiness the secret of success?

Although our Creator endowed each of us with the unalienable rights to life, liberty and the pursuit of happiness, as is all too evident, he did not guarantee us the exercise of those rights.

FORBES: To Live In Liberty

He gives farms a "happiness audit" to check that pigs are raised on a natural diet with ample exercise.

WSJ: High on the Hog