Research is starting to show that some surprisingly simple positive reinforcements ? quick e-mail messages and short phone calls ? can motivate people to get moving.

Sloppy teaching and growing numbers of overly competitive students are giving yoga lovers serious and scary injuries: slipped disks, torn tendons, even strokes.

Can sex impair athletic performance? And are forced repetitions really necessary? Smart Fitness answers your workout questions.

Dara Torres jokes that she had trouble reading the scoreboard after winning the first of two events at the Olympic swimming trials.

Wear, tear, and DNA damage can age you. But aging may also be written into your genes, as it is in worms, scientists report.

A new HIV drug called Isentress has proved successful in lowering levels of the virus even when other drugs have failed.

A new study shows that deep brain stimulation can improve life for those with treatment-resistant depression.

Supplements of fish oil and red yeast rice, coupled with lifestyle changes in diet and exercise habits, can reduce cholesterol as much as standard cholesterol-lowering medications known as statins, according to a new study.