Be sure to alternate between endurance (or aerobic) exercises and resistance training (non-aerobic) exercises. This is very important because each type of exercise promotes weight loss in different, but equally important, ways. Endurance exercises, such as biking, running, swimming, and hiking, get your heart rate up and help your body burn fat as a source of energy. In contrast, resistance training exercises, such as weight-lifting, push ups, and abdominal crunches, help build lean muscle, which in turn increases your metabolic rate. They also help strengthen bones and can help improve posture. Tip: Your muscles burn more calories than your body fat, so try doing resistance exercises 2 to 3 times a week. Avoid exercising the same muscles several days in a row. For example, do bicep curls and chest presses one day to work your upper body and switch to lunges and squats to work your lower body the next day. This will allow your muscles to recov...