The annual post-New Year's Day crowds at local gyms are already beginning to disappear. But it's not too late embrace a simple fitness plan, says Dr. Kenneth Sparks, associate professor in the Department of Health and Human Performance. Dr. Sparks, author of "The Runners Book of Training Secrets" (Rodale Press, 1996), is a former all-American in track and world-class middle-distance runner. He's also a much-loved presence at CSU.