In the United States today, we are starting to see more and more of a problem with children who are overweight. Doctors and even the President's wife are trying to do something about it. Not only are they recommending healthier foods, but they are also recommending that children get daily exercise. They suggest that children go outside and do things instead of sitting in front of the tv. They have suggested that children get at least an hour of exercise a day by doing things like jumping rope or cycling, or anything else that makes their heart beat faster. This kind of exercise is known as aerobic exercise. They also recommend that children do exercises that strengthen their bones and muscles. There are lots of ways children can do this, especially through running.

According to the passage, what is the name of the type of exercise that causes the heart to beat faster?