There are specific sequences for this time of the month which consist primarily of restorative poses. There are some poses that are definitely to be avoided while menstruating such as inversions and closed abdominal twists, unsupported backbends and hand balancing poses. According to Geeta Iyengar ” During menstruation, if one does inversions the blood flow will be arrested. Those who tried to do it out of enthusiasm or callousness will have noticed that the flow stops abruptly. This is certainly not good for health since it may lead to fibroids, cysts, endemetriosis, and cancer, damaging the system.”