The New York Times bestseller that explains how groundbreaking scientific discoveries can help each of us achieve our personal best

Every week, Gretchen Reynolds single-handedly influences how millions of Americans work out. In her popular New York Times column, she debunks myths, spurs conversation, and stirs controversy by questioning widely held beliefs about exercise.

Here, Reynolds consults experts in a range of fields to share paradigm-shifting findings that were previously only available in academic and medical journals, including:

. 20 minutes of cardio is...