This photo provided by the Wake Forest Baptist Medical Center shows Michael Gendy of King, N.C. Gendy continues to exercise after participating in a Wake Forest School of Medicine study that found aerobic activity may lower a risk factor for developing Alzheimer’s. The effects were modest, but a series of studies reported Thursday found vigorous workouts by people with mild memory impairment decreased levels of a warped protein linked to risk of later Alzheimer’s – and improved quality of life for people who already were in early stages of the disease.