No one said that getting skinny is easy, but oftentimes, it's even harder to get curves in all the right places. Kim Kardashian may seem to have it all: the tiny waist, killer curves and sex appeal to boot, but maintaining her physique isn't a walk (or run) in the park. The reality show mogul depends on trainer Gunnar Peterson to show her the right moves that will whittle her waist, while still keeping her upper and lower body feminine and curvy. "Been killing it in the gym with @Gunnar!!! I'm so focused when I'm in LA!" Kardashian twittered recently. The key to achieving that "coke-bottle shape" is to focus on the core and slimming the waist to accentuate the hips and toned bottom. Lunges, squats and torso rotations with a weighted ball are the top three exercises she depends on. Get Kardashian's full workout on Shape.com to unleash your inner curvy girl.