penny weismuller: i still eat candy, and i have dessert once in a while. 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: 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 made us less active. nearly 1/4 of american adults are sedentary. another 1/3 aren't physically active enough to be considered fit. "physically fit" is being able to do whatever you want to do without restriction, either with your body or with endurance. to reach that level of fitness, we need more than just a walk from the parking lot to the mall. we need exercise. thomas mirich: the need for regular exercise transcends not