In it's simplest form, chi is energy. Basically, there are three types of chi. Ancestral chi is the energy, or the DNA, you come in with. Another type of chi is the food that you eat. The more simple your food, the more positive chi your body will receive. The more processed the food, the less chi it contains. Chi is what gives you that vitality and you are what you eat. The third type of chi is environmental chi. What is your home like? Do you surround yourself with things that you like? Have you ever heard anyone say "This place feels great."? This is environmental chi in action.