The simple forward extensions (pashima pratana sthitti) — such as Adho Mukha Virasana, Adho Mukha Svastikasana, Janu Sirsasana, Triang Mukhaikapada in Paschimottatanasana, Ardha Baddha Padma in Paschimottanasana, Marichyasana, Parsva Upavisthakonasana, Adho Mukha Upavisthakonasana done restfully checks the over bleeding, soothes the abdomen and makes the throbbing brain-cells rest. These asanas help those who suffer from head-ache, backache, heavy bleeding, abdominal cramps and fatigue.
The sitting asanas (upavistha sthitti) — such as Svastikasana, Virasana, Padmasana, Baddhakonasana, Upavisthakonasana, Gomukasana, Mulabandhasana etc., help to remove tension and stress. It is also a time where one can deal with knees, hamstrings, groins, ankles, toes in order to lubricate, extend and flex, so that the joints are loosened, and the swelling and pain are eradicated. When the legs are soothed by these asanas the brain too gets calmed.
During the menstruation, it is time for women having arthritic pain to work on their shoulders, elbows and wrists by practising Parsva Baddha Hastasana, Paschim Namaskarasana, Gomukasana (arm position), and rope one for shoulders etc.
So, those who suffer with arthritis, rheumatoid pains, swelling in the joints can give sufficient time to work in those areas, by slowly and gradually releasing and relieving the joints without being aggressive.Those who cannot do Virasana, Padmasana can put in (non-aggressive) energy here to work on the knees as there would be sufficient time, one would not be in a hurry to finish the daily schedule of practice.