nobody knows that better than ernestine shepard. the 75-year-old is being celebrated for her mind. epard has been selected as one of the 2011 most beautiful minds in america. she's an inspiration to the old and the young and here is why. >> reporter: ernestine shepard is calling the shots in this exercise class. at 75 years young, she's not your average fitness instructor. shepard is as fit as any 20- year-old. >> i get up every morning at 3:00 and i'm out running at quarter to 4:00. when i am out running, i just say thank you. what a joy to be able to do this. >> reporter: fitness became a part of her life 20 years ago. she started with her sister who since passed away. her ministry is to inspire and motivate. >> if there were an anti-aging pill, we would call it exercise. >> reporter: it's not just her body thats fit. >> my mind is strong. i can remember everything. >> reporter: shepard has been recognized by the brain health index as one of the 2011 most beautiful minds in america. it's a state by state measure of the nation's brain health. >> it was really an accomplishment. >>