weight in 48 hours. "Experts recommend a safe level of losing two pounds per week," says FITNESS magazine's Fitness Director, Mary Christ Anderson. "One pound equals 3,500 calories, so to lose a pound in two days, you'd need to eat 2,500 fewer calories" — a crash diet that, really, no one should ever attempt. However, it is possible to start developing healthy exercise and eating habits in just two days, which will set you up to drop the weight that you want — five pounds, 10 pounds, or more. To start, make a "plan of attack," suggests Harley Pasternak, celebrity trainer and creator of The 5-Factor Diet. Draft a grocery list to buy enough grub for 5 small meals a day. You'll also want to schedule when you'll eat and work out, just as you would write down a hair appointment or a dinner date. Need some extra incentive? Pick up some new workout gear. "A new pair of athletic shoes can give you that extra push to be active," sa...