When you feel comfortable enough, try these exercises.
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Quadruped opposite arm opposite leg. Kneel on your knees and hands. Tighten your abdominal muscles. At the same time, raise and straighten your right arm and left leg until they're parallel to the ground. Tighten the muscles in your buttocks and thigh. Hold for 2 seconds and come back slowly to a starting position. Repeat with left arm and right leg, alternating 10 times.
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Prone opposite arm opposite leg. Lie face down, arms extended overhead, palms on the floor. At the same time, raise your right arm and left leg as high as comfortably possible. Hold for 10 seconds and slowly return to start. Repeat with left arm and right leg, alternating 10 times. Gradually build up to 20 times. (Advanced: Repeat this exercise raising both arms and both legs a few inches off the floor at the same time. Hold for 5 seconds and release.)
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Pelvic tilt. Lie on the floor on your back with your knees bent at 90 degrees. The back of your head should be touching the floor and your neck should be aligned with your spine. Your feet should be flat on the floor. Allow your back to maintain a natural curve, leaving space between your lower back and the floor. Inhale, and as you exhale, slowly contract your abdominal muscles, bringing your belly button toward your spine slightly. You'll feel a gentle stretch of your lower back. Let your pelvis rock back until your back is flat on the floor. Hold for 10 seconds while breathing smoothly. Inhale, allowing your spine and pelvis to return to the original position.
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Abdominal crunch. Do a pelvic tilt (above), flattening your back against the floor. Holding the tension in your abdominal muscles, take another breath and raise your shoulder blades off the ground (this is not a full sit-up). Keep your head in line with your body (don’t bend your neck forward). Hold for 2 seconds, then slowly lower without fully relaxing. Keep the tension on the abs throughout the entire movement. Avoid relaxing your shoulders onto the floor.