The new physical activity guidelines released last week by the federal government are aimed at keeping Americans healthy ? but what if you also want to be buff?

You can blame your energy crisis on a lack of shut-eye, but there may be other reasons you're slogging along like a turtle. Find out what's fueling your fatigue.

Get moving: The nation's new exercise guidelines set a minimum sweat allotment for good health. For most adults, that's 2 hours a week.

Do you always have to max out with weights? And will a week off from the gym wipe out your fitness gains? Smart Fitness answers your workout queries.

If you?re trying to shape up, there?s no shortage of exercise equipment and workouts promising to deliver bigger, better, faster results. But are they really all that?

Obese people find food less rewarding than lean people do, a study shows. To compensate, they eat too much. And the effect is greater in those with a genetic defect in the brain's reward circuit.

At least 58 people in the U.S., mainly teenage boys, died from injuries suffered while car surfing from 1990 to 2008, the CDC reports.

Researchers in Germany sought to examine whether day-to-day weather affected people?s moods.

Janet Jackson has a "rare form of migraine called vestibular migraine or migraine-associated vertigo," according to a statement released by her publicists.