Can anyone relate - ever since my teens any attempt at training abs resulted in some painful abdominal cramping. Now that I'm close to 30 it got much worse, a few sit ups and I find myself in a world of pain, the cramping is so intense the muscle stays sore for days. Anyone is in a similar condition, and/or managed find a solution? My idea is to gradually get the muscle accustomed to stimulation, light yet frequent work. I'm starting as simple as bodyweight planking 2-3 times a day, without reaching the point of fatigue.