Stomach cramps after exercise

I have a 30-year-old, body fat content, I would like to ask something, I finished each exercise, such as sit-ups, you stomach cramps, feeling the stomach which has several relatively large lump, pain of severe, Like anything pulling the same pain, please know that this knowledge of people to help answer Thank you.

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estimated to be abdominal cramps. Note progressive exercise in peacetime, from simple to complex, from a small number of times over to many times.