One of the studies divided a group of seniors into two different six-month exercise courses one course consisting of aerobic exercise, the other consisting of stretching and toning.
Again, we'renot talking about marathon-training here.
The aerobic-training course gradually built its participants up to walking 45 minutes at a moderate pace three times a week.
At the end of the course, the people who completed the aerobic training showed significant improvements in attention-related mental tasks.
The stretching and toning group showed little improvement.