Some of this territory was covered by Mr. Crowley and internist Henry S. Lodge in their previous two "Younger Next Year" books, which focused on exercise as an elixir of youth that can reverse aging processes inside cells and spawned a website, DVDs, workout gear and Aspen retreats.

WSJ: Healthy Reader: 'Thinner This Year,' by Chris Crowley and Jen Sacheck

Again, volumes of books have been written about various exercise regimens.

FORBES: How To Stay Healthy

Which? magazine, published by the Consumers' Association, asked experts in nutrition, exercise and psychology to assess the most popular diet books on the market.

BBC: Health risk of 'faddy diets'

Amazon.com (nasdaq: AMZN - news - people ) offers hundreds of books about dieting and hundreds more about exercise--all of which can be yours without so much as a walk to the bookstore.

FORBES: Fat And Happy In Oak Brook And Beijing

Books like Spark: The Revolutionary New Science of Exercise and The Brain by psychiatrist John J.

FORBES: Fighting Obesity In Kids With A Cool, Affordable Gadget

Psychiatrists, therapists, self-help books - everyone recommends good "sleep hygiene", regular exercise, structured social activities and, above all, taking your medication daily and on time.

BBC: Bipolar holiday

He founded his own company in 1967 to package books for other publishers, then developed his own book list, starting with "Yoga: 28 Day Exercise Plan, " still in print.

WSJ: Workman Founder Sold Quirky Books