Muscles deep within the abdomen and pelvis support the spine against gravity like a corset, stabilizing and protecting youthful posture. To locate these core muscles, sit upright, feet flat on the floor. Exhaling, draw your abdominal muscles back, as if taking your navel toward your lower back. Feel a slight scooping, hollowing or zipping up. Donít hold your breath or squeeze tightly. Release. Now pull up your pelvic floor muscles. Release. Breathing evenly, engage both sets of internal muscles, keeping your stomach and buttocks soft. Engage your core during everyday tasks: this gives particularly good support while driving.