Faith is defined as what is cherished in the heart and believed by the mind, which is the sincere certainty that is in the heart of the believing person, that is, the power of faith is in the heart and not in the body. Faith is the principle that never departs from the heart.
When things are bad and we're hoping for a miracle, hope plays a big part in our ability to have some sort of faith. That is why we must do something to boost our spirit and confidence to pull through those had times.
Also when doing something our minds are so busy, that we forget to fret about our situation.