See the rest of Slate's Fitness Issue.
Also in Slate's Fitness issue, Emily Yoffe gets shredded by Jillian Michaels and coddled by Jack LaLanne and our foreign correspondents reveal the latest global workout trends.
The Grandparent Trap The shameful problem of elder financial abuse is only going to get worse.
What We Like Right Now Our favorite picks for the week of July 27, curated by Slate writers and editors.
The End of the Tour David Foster Wallace is at the center of a movie of ideas that contains actual ideas.
It Took 22 Years for the Women’s 1,500-Meters Record to Fall. What's the Fastest Humans Can Possibly Run?