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Bonnie, I am just a little younger than your dad, 63/2, and I have always walked a lot but am having some difficulty keeping it up.due to assorted things, pain, age and PD possibly. But I have found that riding an exercise bike does not put the strain on the old knees and feet and back that walking does. So I highly reccomend using the bike/ But even better is swimming.If there is any way your dad can swim (in a heated pool) then he should do it. After s soak in a hot tub and 30 minutes swimming or walking in the water I feel really good. And if I do have to stop walking outside some time in the future, I hope to continue the other exercises. Lanier Maddux Chattanooga Tenn.