Sarah Blakely (Founder of Spanx for those who aren't familiar) is launching a new product. Watching someone who's already carved her name into the world, roll up her sleeves and dive into the startup grind again—this time with her kids by her side—is something else. A nice reminder that the real juice isn’t in the finish line; it’s in the trenches, where you’re sweating it out, figuring it out, and making it happen. Any guesses on what this new product will be?