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.
Roasting times for a turkey breast cooked in a 325 degrees F oven: Unstuffed, a 2 to 3-pound turkey will cook from 1 1/2 to 2 hours. Unstuffed, a 4 to 6-pound turkey will cook from 1 1/2 to 2 1/4 hours.Unstuffed, a 7 to 8-pound turkey will cook from 2 1/4 to 3 1/4 hours; if stuffed, it will cook in 3 to 4 hours.et the meat breast-side up in the pan. Roast for about 2 hours or until an instant read thermometer inserted into the thickest part of the breast registers 160 degrees F. Transfer the turkey to a cutting board and tent loosely with foil for 20 minutes. The breast temperature will continue to rise as it rests.