The Importance of Exercise for Longevity

Exercising could be important for longevity, but how much is too much and when's it not worth it? The author suggests a centenarian diet decathlon he calls it. Pick the activities that you'd like to do when you're 100 years old, and say what they are. He gives a sample: hike one and a half miles on a hilly trail,. get up off the floor under your own power, carry two five pound bags of groceries for five blocks., lift a 20 pound suitcase into the overhead compartment of a plane.