"Tightening up your torso and that ring around your waist, back and upper butt requires lots of cardio and a stepped-up ab/core routine," says Kirsch, who has worked with Liv Tyler, Anne Hathaway
and Faith Hill.THE PLAN
45 minutes of cardio/light-weights four to five times per week. If you're bored with running or using the elliptical trainer, mix in jumping rope, swimming or rowing. You can also try one of Kirsch's workouts on his Ultimate New York Body Plan DVD
Ab/core routine three times per week. "Perform the exercises nice and slow, and really focus on contracting each muscle," says Kirsch.