fitness

Robyn Mendenhall Gardner was amazed when what started off as a monthlong ab workout challenge between friends and family caught fire on the Web.

The Montana mother of eight told Shots she came across a 30-day ab fitness plan online and, after having a tough time finishing it, turned it into a Facebook event to motivate herself.

If you're in your 20s, you might work out because it's fun, or because it makes you look better. But here's another reason to hit the gym or go for a jog — exercising now may help preserve your memory and cognition later in life.

Researchers figured this out by following 2,700 men and women for 25 years as part of the Coronary Artery Risk Development in Young Adults Study.

Flickr Photo/Jeanette Goodrich (CC BY-NC-ND)

Marcie Sillman talks to registered dietitian Mary Purdy about the pitfalls of counting calories to lose weight.