She's married, but she can't resist him.

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Week 1: Monday

Julia was on the treadmill when she first saw him. She couldn't say what it was that made her look at him. He wasn't as young, fit or good looking as some of the other men at the gym. In fact, he looked very much like he could be a friend of her husband's, or a husband of one of her friends. He looked to be around 40 and he was exercising hard, presumably to do something about that burgeoning middle age spread that was starting to appear.

Julia kept running. She was did a 30-minute run on the...