Cedar Rapids Chiropractor. Dr. Chris Cummings provides Sports Injury, Fibromyalgia, Arthritis, Adjustment, Back Pain, Neck Pain, Shoulder Pain, back pain relief, neck pain relief to the following locations: Marion, Hiwatha, Robins, . Marion Chiropractor providing Sports Injury, Fibromyalgia, Arthritis, Adjustment, Back Pain, Neck Pain, Shoulder Pain in Cedar Rapids, Iowa.