word "rechaka" means exhale. Common jargon
heard in any yoga
Usually rechaka is associated with marshalled pranayama practice ie. used by instructor to inform aspirants to exhale (possibly after a while of sustained breath retention ie. kumbhaka).
When feeling really ill and yet in a yoga shala, rechaka may sound and feel like great relief; especially when your nose runs and you can't breath very well. Probably next puraka will make you think the real reason why did you drag your sorry ass to a training hall when you really should have stayed in bed (well, one can always do the practice, it's just after the practice when it hurts...).
See also puraka.