The 4-Hour Body is the result of an obsessive quest, spanning more than a decade, to hack the human body. It contains the collective wisdom of hundreds of elite athletes, dozens of MDs, and thousands of hours of jaw-dropping personal experimentation. From Olympic training centers to black-market laboratories, from Silicon Valley to South Africa, Tim Ferriss, the #1 New York TimesThe 4-Hour Workweek, fixated on one life-changing question: 

For all things physical, what are the tiniest changes that produce the biggest results?

Thousands of tests later, this book contains the answers for both men and women.

An Enterprising Life is the autobiography of the other cofounder, septuagenarian Jay Van Andel. He is the quieter of the two, and is thought by some commentators to be the financial and management expert behind the direct sales giant. Readers curious about the true nature of Amway and the principles behind its growth, however, will be disappointed by his report. Only four of the 21 chapters deal with the company (offering little new insight), while five others mechanically recite Van Andel's life from birth to age 25.