Ab/Lower-Back Extension
Lie flat on your back with the band wrapped under the bottom of your feet. Grab the bands and hold them at your hips with your arms fully extended on the floor. Keeping your arms and legs straight, jackknife your arms and legs up until the body is in a V position with just your upper buttocks on the floor. Push back down to full, flat extension on the floor. (Note: A more resistant band places emphasis on the lower back; a lighter band makes the abs work harder.) Do two sets of 30 to 50 reps.
Bench Press
Wrap the band around the back leg of the bench. Lie with your back on the bench and your feet on the floor. Hold the handles with your elbows bent and your hands in line with your chest. Press your arms straight up until your hands are over midchest. Lower and repeat.