I've been doing the song shen wu fa as presented by Master Huang Sheng Shyan (also popularized by many present day CMC stylists). I found they are very relaxing and do generate great amount of Qi in the body (or rather releases tensions, to let the qi flow freely).
One that I find very interesting is the penultimate one, where we bend at the waist and turn side to side (besides the shoulder rolls). I found that doing this seems to trigger bowel movements that are border-line alarming. Is this something to be worried about? I suspect that the twisting motion is massaging the organs, thereby triggering more peristaltic movement and is effectively cleansing, but I want to be sure.
I've never had problems with constipation etc, so when I do this, I end up going to the bathroom 4-5 times a day.
My apologies if the question is off-putting, but i'm curious to know. So I can teach this to my students too...