1 If you're a beginner, start with 3 to 4 days of the cardio exercise of your choice, working at a level you can handle.  Add time each week to work your way up to 30 to 45 minutes of continuous exercise.
Center turkey breast on rack. Transfer to oven, and roast until juices run clear and an instant-read thermometer reads 165 degrees when inserted into the thickest part of the breast, about 1 hour and 20 minutes.Transfer to a platter, and let rest for 10 minutes before carving.enter turkey breast on rack. Transfer to oven, and roast until juices run clear and an instant-read thermometer reads 165 degrees when inserted into the thickest part of the breast, about 1 hour and 20 minutes.
Bake the turkey breast for two to three hours. The size of the breast determines the exact roasting time. Insert a meat thermometer into the thickest portion of the breast toward the end of the cooking time. A minimum safe temperature, according to the U.S. Department of Agriculture, is 165 degrees Fahrenheit.