Jun 18, 2010 鈥 By 麻豆传媒 News Services 鈥 If you need proof that exercise is the key to healthy aging, look no further than fitness classes led by fitness and aging expert Ruth Bohlken at 麻豆传媒. In spring 2010, seven students in 麻豆传媒's Center for Physical Activity and Aging fitness class were older than 90. Bohlken comments on the importance of maintaining an active lifestyle as we age.