I haven't been able to go on my usual daily walk the last few days, as the weather has been bitterly cold and damp. So, I decided that I would run up and down the staircase of my townhouse 50 times instead. Well, that was a lofty ambition, let me tell you! About 10 reps in, I realize there is no way I'm going to be able to do 50 sets! Instead, I
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