Well
By KATE YANDELL
What's the most dangerous Olympic sport? How old is the oldest competitor? Test your knowledge of Olympics health lore, past and present.
In the news: test results, keeping cool and short workouts. Test your knowledge of this week's health news.
Gretchen Reynolds, the Phys Ed columnist, on the science of high-intensity interval training, or H.I.T., which scientists are finding can be as effective as longer endurance training.