A big help in asthma is breath gymnastic,as teaching to breathe assurfacely, do not deep breathe in, and fast breathe out,as leading tillbreathe prolonging.

At two exercises doing at real time.
As breathe in through nose, breathe out through mouth, lips are formed rolled tubers, as breathe in are prolonging till two times for breathing in.
Sit on chair, spine pressed to chair s wall, legs put on a widen a shoulders, wrists are on knees, breathe in and out calming, slowly breathe in, prolong his for two sec, lead till a pause with breathe out with three sec till 5, after till ten, and best till 15, repeating for three times.