Sarvangasana is against astma.

As pose for all body parts, as of stay on head, and easy doing for young and on middle ages,and in adults with a chronic diseases needing in doctor asking, and avoiding in hypertension, atherosclerosis, as on acute and chronic diseases.And this asana improves blood circulation for brain, curing veins, hemorrhoid, venous blood circulation stimulates, useful bronchial ashtma, inside glands secretions bad, and for those who working as stay.
Lie is on spine, stretching hands for body along with palms to the floor, slowly rise legs and not bending in knees theirs. After support with palms in waist,fingers big are to externally, and rise theirs a pelvis till a body forming as vertically, and legs are on the same line a body,rising legs doing breathe out. And in this pose you are supporting in floor with shoulders,neck, occiput, and chin touching for softer a jugular fossa, and try to maximal relax, a full breath without loading.And for returning back, as slightly bend legs and lead to breast, softer down on the floor a pelvis, and legs after, body not fallen is on the floor, and after back returning, lie calm are 20 minutes,And on the exercises doing a time as attention concentration is on the same and slow moves of legs and body, as in static phase of sarvangasana as all attention directing is on the thyroid gland. And on begin to fix a pose are for 2 sec, if you have not bad feels thus within a month rise a time till ten sec, after adding on 15 sec/month, lead a fixation time for pose till minute, and sarvangasana you must to add in an every day doing a yoga.