Consistent practice is necessary to heal the tough chronic illnesses as the tough illnesses normally are caused by strong blockages which can only be removed slowly by the consistent practice of Crane Qigong. Each practice will remove a small piece of the blockage while the blockage may still continue to grow. The inconsistent practice will benefit the growth of the blockage. To remove the blockage, consistent practice is necessary. And the strength of practice must be greater than the growth of blockage.