Intense exercise is best for whittling down fat.

The study, which followed 27 middle-aged obese women, found that those who exercised at a high intensity for four months successfully shed fat from their midsections. Women who exercised at a low intensity, however, showed no such changes in body fat.

The findings suggest that for people who want to change their body composition, the intensity of the exercise is matters, researchers report in the journal Medicine & Science in Sports & Exercise.

Strength training helps ease arthritis pain in the knees.

Trauma- or age-related osteoarthritis of the knee results in progressive and often painful fraying and breakdown of cartilage. However, studies indicate that the leg muscle weakness commonly associated with knee osteoarthritis is potentially modifiable by resistance training, Angela K. Lange and colleagues report in the journal Arthritis and Rheumatism.

In up to 75 percent of the studies, the researchers identified clinically meaningful improvements in physical function and strength among resistance training, compared with usual care, participants.

These findings support the efficacy of resistance training in many patients with knee osteoarthritis, Lange and colleagues note.

Tai chi helps cut pain of arthritis in knees.

n their study, one group of people in their 60s with severe knee osteoarthritis performed tai chi for an hour twice a week for 12 weeks while a similar group did the same amount of conventional stretching exercises over the same period.

Those who did tai chi experienced greater pain reduction, less depression and improvements in physical function and overall health, researchers led by Dr. Chenchen Wang of Tufts Medical Center in Boston reported at a meeting of the American College of Rheumatology in San Francisco.