DEAR DR. DONOHUE: I am 72 years old. I walk up and down 15 flights of stairs, each flight having 17 steps. I do this once a day. Is that enough exercise for me? -- J.G. ANSWER: Walking up and down stairs is wonderful exercise if you spend enough time doing it and if your pace isn't that of a snail's. The calorie cost of climbing stairs is around 0.4 calories per step; 0.

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