Children diagnosed with Hirschsprung's disease lack nerve cells (ganglia) in the large intestine, severely affecting the wavelike movements that propel material through the colon.
Normally, the colon is quiet during most of that period except after meals, when its muscles contract in a series of wavelike movements called peristalsis.
Dolphin kick your legs -- this kick involves keeping the feet together and moving the legs in a wavelike, undulating motion.