Just one third of the Kardashian sisters trinity and the smallest one of all, Kourtney Kardashian has most certainly made a name for herself. The reality TV star turned mom went through the trials of pregnancy and early motherhood on national television—baby weight and all. Now as the cover girl of Shape magazine, reveals that she lost the 40 lbs. thanks to 7 a.m. workouts with trainers David Barton and Tracy Anderson. Eating oatmeal and all organic foods, Kardashian toned up with lunges, frequent cardio, high knees and a running workout. Check out Kourtney’s exercise routine on Shape.com and download a few of her favorite workout songs to get pumped up.