Tiger Woods will undergo reconstructive knee surgery, his website reports, and will miss the remainder of 2008 season due to knee injury.

New study calls for increased use of protective equipment to reduce in school sports related injuries, particularly in regard to baseball-related injuries.

For the first time researchers are beginning to understand exactly how various forms of exercise impact the heart. Massachusetts General Hospital (MGH) investigators, in collaboration with the Harvard University Health Services, have found that 90 days of vigorous athletic training produces significant changes in cardiac structure and function and that the type of change varies with the type of exercise performed. Their study appears in the April Journal of Applied Physiology.

As the weather grows warmer, baseball and softball leagues swing into action, soccer and tennis matches start up and cyclists and runners hit the road. The health benefits are substantial for those who regularly participate in sports and physical activity. But unfortunately, according to the United States Centers for Disease Control and Prevention (CDC), 10,000 emergency room visits per day are the result of participation in sports, recreation or exercise. That's 3.65 million ER trips per year. How can those injuries be reduced?

As summer quickly approaches, many of us are scrambling to find a workout regimen that will get us the fastest results so we can look good by Memorial Day. The International Sports Sciences Association (ISSA) polled their member database -- nearly 100,000 personal trainers and health professionals strong -- their survey recommended trying the following exercises for each body part to get your best summer beach body:

1. Chest: incline and decline dumbbell presses

2. Back: seated lat rows

3. Lower Back: reverse hypers

Older women loose more muscle mass than men and they need regular exercising and protein eating to preserve muscle.

When it comes to exercise and fitness the neighborhoods people live in can help inspire - or discourage - their residents to exercise and keep physically active.

Elderly adults at risk for physical disabilities are able to adhere to a regular program of moderate exercise for one year.

Short but intense sessions of exercise may help women on bed rest stay strong and recuperate more quickly.

Physiotherapy can improve the daily lives of patients who have had knee replacement surgery due to osteoarthritis in the short term.

The contestants of NBC's hit show The Biggest Loser are showing off this season's latest fitness fashion accessory, the bodybugg armband, which measures the number of calories that they burn, aiding in their weight loss efforts.

Illinois Department of Public Health held its 13th annual Fitness Day to encourage employees who spend most of their day in the workplace, to be more physically active.

This is Physical Fitness Month, and I am with members of the President's Physical Fitness Council.

Their job is to encourage all Americans, young and old, to exercise.

National Physical Fitness and Sports Month is an opportunity to educate Americans about the importance of healthy habits and regular physical activity.