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.
After 20 minutes, baste the turkey breasts with the remaining butter, and roast for an additional 20 to 25 minutes, until cooked through, and a thermometer placed in the thickest part of the breast registers 170 degrees F.fter 20 minutes, baste the turkey breasts with the remaining butter, and roast for an additional 20 to 25 minutes, until cooked through, and a thermometer placed in the thickest part of the breast registers 170 degrees F.