I've done blood test today and my Creatine Kinase level shown is 322 IU/L. What does that indicate? How can I reduce this CK level to normal range?

Muscle issue. Creatine Kinase is an enzyme in muscles and any issue affecting the muscles, including exercise, can raise CK levels. You need to address the cause of the elevation. You may consult this site and then discuss the matter with your doctor who ordered the test. http://www.mayomedicallaboratories.com/test-catalog/Clinical+and+Interpretive/8336.