During the study, half walked 150 minutes a week and did strength, flexibility and balance training. The others took a health education program and did stretching exercises
Thirty percent of the people in the exercise group lost the ability to walk a quarter mile, compared to 35 percent of the people in the health education group.
Researchers say although the difference between the 2 groups is small, the findings suggest structured physical activity may help improve mobility as we age.
They also plan to look at the data to see how physical activity affected the participants' memory and mental functions.