What if you could reclaim your strength, your stamina, your flexibility, and your sense of well-being? What if there were a prescription that could improve your fitness, lower your cholesterol, and reduce your body fat in just 3 weeks? Welcome to the world of the Spark, where what if? becomes an exciting reality. Based on the groundbreaking Spark Study 2000 conducted by Dr. Glenn A. Gaesser at the University of Virginia, The Spark shows you how short,...