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.
What Happened at Slate This Week? See if you can keep pace with the copy desk, Slate’s most comprehensive reading team.
Bad as They Wanna Be Is the Philadelphia 76ers’ lose-on-purpose approach to team-building ingenious or morally bankrupt?