Push up. Some may think, putting the push up at the end is rather easy. Those people likely do slopy pushups. The pushup in Pilates is beautiful. The elbow bend retracts the shoulder blades to allow for the protraction and engagement through serratus anterior (something that is very hard for most of us to do), then you hinge at your hips, control with your torso (while not moving your hips) and walk your hands through upward rotation to your feet. Now you have a spine stretch, to recoil the back body fascia and lengthen through the front. Really the movement is magic and feels that way too.
Primary focus: Full body integration
Secondary focus: Full body integration :)