Hi. I am a 30yr old male with a complicated past. I am 5'9", about 260lbs, obese. I have had 4 abdominal surgeries and my intestines has been cut 3 times. I am trying to strengthen my abdominal muscles, but when I do crunches, my entire abdominal region goes into painful abdominal cramping. Also, when I bend over by the abdominal region to pick things knee high or on the floor, the cramps starts. What can I do?