I read this book thanks to Blinkist.
The key message in this book:
It's completely natural to worry from time to time. But it's a problem when your life is controlled by fears and anxieties. Fortunately, there are ways we can calm our mind and get some relief. The brain is very capable of falling into patterns that constantly promote stressful thoughts. But we can add new patterns to our daily routine, and, before long, change the negative into a positive.
Next time you feel a bit worried about a job interview or taking an important phone call, try smiling! By holding a smile for a minute, you'll find that your worry will begin to vanish. That's because of the interconnectedness between your physiology and your internal, emotional state. So go ahead. Show those pearly whites!
Suggested further reading:
Positivity by Barbara L. Fredrickson
Positivity presents the latest research into the positive emotions that are the foundation of our happiness. By presenting different strategies to increase the amount of positive emotions you experience, this book will help you adopt a positive general attitude toward life.