There are two main types of exercise that you can do - aerobic and anaerobic. The first one, aerobic, means with oxygen. Aerobic type exercise has an important distinction, it burns fat as the main fuel. Anaerobic on the other hand, burns sugar as the main source of fuel. Despite common myths, exercise doesn't ... and the strength of your heart. With just a little bit of your time devoted to exercise, you'll find yourself healthier than you have ever been in the past.