penny weismuller: i still eat candy, and i have dessert once in whe. but primarily, i look at the stuff and i say, "you know, i like the energy and the clear thinking that healthy food choice allows." it's still my mantra. "the human condition" is a 26-part series about health and wellness. for more information on this program, and accompanying materials, call: or, visit us online at: [♪...] >> female announcer: some dreams are universal... dreams that inspire us. multiple sclerosis is a devastating disease that changes lives forever. the national ms society does more for people with ms than any organization in the world... but we can't do it alone. to get involved, visit us online at nationalmssociety.org or call 1-800-fight ms. this is why we're here... because nobody dreams of having multiple sclerosis. narrator: people who exercise regularly have a 43% lower risk of premature death compared to those who are sedentary. are you physically fit? can your body respond to the demands that are placed on it? technology has made life easier, but it has also

penny weismuller: when i had two little boys two years apart, i didn't have the opportunity to exercise and then you start being so tired and bad eating habits crept in. mary pat anderson: i like food. so one of the reasons that i've carried weight for quite a while is because of just eating too much and not caring enough about how i look. ralph cygan: today there are more than 100 million americans who are either overweight or obese. i think we have a very serious public health problem on our hands that we need to address as a nation.