leading lady, Katherine Heigl
, works with celebrity trainer Harley Pasternak
to keep herself fit, but doesn't worry about achieving an athletic appearance, "It's just not me and I don't have that kind of discipline," she says. Instead Heigl works with Pasternak to keep her body healthy (she follows his 5-factor diet) and focuses on small but important details like posture. "For me it's never about achieving a look that's impossible," she says.