An imprint of Penguin Random House

375 Hudson Street

New York, New York 10014

Copyright © 2015 by Kelly McGonigal, Ph.D.

Penguin supports copyright. Copyright fuels creativity, encourages diverse voices, promotes free speech, and creates a vibrant culture. Thank you for buying an authorized edition of this book and for complying with copyright laws by not reproducing, scanning, or distributing any part of it in any form without permission. You are supporting writers and allowing Penguin to continue to publish books for every reader.

Most Avery books are available at special quantity discounts for bulk purchase for sales promotions, premiums, fund-raising, and educational needs. Special books or book excerpts also can be created to fit specific needs. For details, write SpecialMarkets@penguinrandomhouse.com.

ISBN: 978-0-698-17080-3

PUBLISHER’S NOTE

Neither the publisher nor the author is engaged in rendering professional advice or services to the individual reader. The ideas, procedures, and suggestions contained in this book are not intended as a substitute for consulting with your physician. All matters regarding your health require medical supervision. Neither the author nor the publisher shall be liable or responsible for any loss or damage allegedly arising from any information or suggestion in this book.

While the author has made every effort to provide accurate telephone numbers, Internet addresses, and other contact information at the time of publication, neither the publisher nor the author assumes any responsibility for errors, or for changes that occur after publication. Further, the publisher does not have any control over and does not assume any responsibility for author or third-party websites or their content.

AUTHOR’S NOTE

Throughout the book, when only first names are used, the names are pseudonyms, and some details of the stories have been changed to protect individuals’ privacy. Whenever possible, I obtained permission to use these stories. If direct quotes are included in the stories, they are from email or personal exchanges and have not been altered. In all other cases, where full names are used, all quotes and details are from interviews I conducted and/or from published sources cited in the notes.