Supersets involve exercising. A superset is when the person does two types of exercising without resting. In other words, these two exercises are done back to back without any time in between them spent relaxing. There are many reasons to do supersets. One reason is because you may not have a lot of time to devote to exercising if you are really busy. Another reason is because you may be doing different exercises that target different parts of the body.
When exercising, it is always good to keep your heart rate up. When you exercise with your heart rate up, then they makes the exercising more beneficial to your health. This type of exercising also helps you build muscles and increase muscle growth.