Dear Munkunda,
Lot of people, including myself, are suffering from constipation for time to time. Some people even consider it normal to have bovel movements every two days or so. It is always recommended to evacuate your bowels before starting asana practice. However, it is not often easy - or nearly impossible.
Some people have tendency to get easily constipated - or bowel movements getting irregular, even though following yogic diet based on ayurvedic principles and meals being at regular times. I am using the ayurvedic product trifala to regulate my bowel movements in case they get disturbed and have managed to make them happen regularly at 8:45 every morning.
Now, I would like to make them happen at 5 am, before I start my asana practice. To achieve this, I have been drinking 1,5 litres of warm water right after getting up from bed and going to toilet and waiting for bowel movements, without desired effect. Then I do my asanas (starting with pawanmuktasana part II - from Bihar APMB book - and followed with others) and have my breakfast. Only one hour after breakfast I have the bowel movements.
What are the best ways of regulating apana vayu - and having bowel movements at set time in the morning? Any apanic foods to suggest? Reflexology / acu pressure points? Essential oils? Is there some mantra for apana vayu? Meditation / visualisation?