In Vipassana you have to be just aware of your breath. A simple rule is that no matter what you do, no matter in whichever action you indulged in – just be aware of your breathing process. Be watchful of breath as it comes inside your body and goes outside. Don’t try to control your breath. Vipassana is not ‘Pranayam ( the yogic exercise in which one control various movements of breath). If your breath is deep let it be, if it is shallow let it be. Just let your breathing in its natural rhythm.