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So I have the iPhone 3G, all of a sudden the phone just turn off.. but its not completely black, when I try to charge it.. the battery picture comes up & with a little thunder signal under it showing its charging.. but there's no percentage on how much time is completed. I try to plug it to my...

So I have like approximately 12 stairs in my staircase, and I'm planning on walking up & down on these stairs to exercise. Do you guys think it will be effective as a workout with so little stairs?