LA JOLLA, Calif., Jan.

By MIKE SWAIN SCIENCE EDITOR IT'S the breakthrough couch potatoes have been praying for. Scientists have come up with a drug that mimics the effects of exercise - and it's already in advanced trials.

By ALAN ZAREMBO By Alan Zarembo Los Angeles Times Scientists have discovered what could be the ultimate workout for couch potatoes: exercise in a pill.

By Jeremy Laurance; Amol Rajan Beijing OLYMPICS 2008 A new threat to the Beijing Olympics has emerged in the shape of two new undetectable drugs that could boost the performance of endurance athletes by a medal-winning margin.

HOUSTON, Feb.