The Workout That Does It All 1 of 5 Exercise One: The Eagle Starting position: Sit comfortably on a chair or stool, with feet flat on the floor, shoulder width apart, your thighs and shins creating a 90-degree angle. Keep your back straight and let your arms fall next to your hips. Make sure not to round your shoulders. Target muscles: Core (28 muscles in your torso, including abs and lower back), posterior deltoids and trapezius (shoulder area), rhomboids (upper back), calves, hamstrings, quadriceps, hip flexors, and gluteus maximus (butt). The Eagle: Weeks 1-3 » From The Workout That Does it All in the March 2006 issue of O, The Oprah Magazine. Subscribe now! Exercise Two: The Caterpillar Circuit Exercise Three: The Jaguar