The 4-Hour Body is a complete guide to hacking your health, helping you achieve anything from rapid fat loss and quick muscle gain for better all-round health.

Over the course of a decade, Tim Ferriss has assessed everything about the functionings of the human body – from weight loss and muscle gain, to endurance and speed.

The resulting book is an encyclopedia of health, that can quickly teach you how to make the best out of your body and feel better in every aspect of your life.

Ferriss's approach focuses on finding out the underlying principles dictating how health should be tackled, so you can find a diet that is both healthy and flexible.

By implementing his techniques, you'll be able to thrive and reach your goals faster - without losing sleep over it.