My roommate is working on losing 10-15 pounds - including her double chin. She is doing the elliptical and treadmill, and is losing weight, but not the double chin. Someone told her doing the elliptical and treadmill will not work on losing it. She is frustrated and I want to help her. Is elliptical/treadmill not going to help her lose the double chin? What can she do? How long does it take to lose a double chin?