What kind of running shoes do you have? I need some good ones, if I'm going to do this "exercise" thing for real. I wouldn't mind a link to a good sports bra, either, if we're talking about a good one for the, um, top-heavy woman.

About finding the same exercise harder than it was last week, I've found that my endurance and strength vary with my cycle: certain times of the month, I have the stamina of a wet egg noodle, and approximately the same lung capacity, despite the inhaler. From what I've read, it's not unusual.