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.
Calculate the cooking time. The larger your turkey breast, the longer it will take to cook. When roasted at 325 Â°F (163 Â°C), turkey breast requires approximately 25 minutes cooking time per pound. 1  For a smaller four to six pound turkey breast, set aside between 1 1/2 and 2 1/2 hours.2  If you're cooking at an altitude of 5,000 or more feet, you'll need to add five to ten extra minutes' cooking time per pound.oneless turkey breast can be bought fresh or frozen by the pound. Turkey breasts are much larger than chicken breasts, so you'll want to factor that in when you decide how much to buy. A serving size of turkey breast comes out to 1/4 to 1/2 pound per person.