We are still talking about constipation here! Seated forward bends are an excellent way to work on clearing the lower abdomen (this is why they are also the hallmark of the menstruation practice). However, seated forward bends can be difficult for us when we are tight in the hips, buttocks and hamstrings.
Try starting with Adho Mukha Swastikasana (simple cross-legs, coming forward) and Adho Mukha Virasana (more commonly called child's pose). Note, that I have placed a rolled blanket in the abdomen. This can be done in all the poses and is especially helpful is you are
Then attempt the king (or queen?) of seated forward bends, Paschimottanasana (intense stretch of the west/backside of the body). I have places a length-wise bolster all the way up into the abdominal cavity. Rolled blankets can also be used. Please use enough height so that you keep the sacrum in a healthy, neutral position to protect your lower back.
Finish up by doing a couple of seated twists, Bharadvajasana I. Repetition in the twists is better than holding so do 3-4 rounds.