Think about the last big project you tackled. You made a list of things to accomplish, and gleefully checked them off one at a time until it was done. Why not do that for fitness? "Real, lasting success is created not in some massive show of effort, but in a series of small steps taken every day," says fitness and nutrition expert Adam Rosante, author of The 30-Second Body. And we do mean small: Rosante asks you to exercise for only 45 seconds on the first day of this monthlong plan. It begins with just jumping jacks (you're already good at those!) and squats, and slowly builds until you have a 30-minute, full-body, fat-burning workout you can definitely do. How can we be so sure? There are only eight moves total, and starting with fewer reps will help you perfect them. Since no woman should have to go it alone, the REDBOOK team tried the plan too, and we're leaner and stronger for it. But we know as well as anyone that sometimes that to-do list has to be pushed off until tomorrow. That's okay. "If it's been less than a week since you last worked out, pick back up where you left off," Rosante says. "Any longer, start from the beginning." It won't be longer, though, because once you start this challenge, you won't want to stop. You'll be like us: sweaty— and dripping with confidence.