It doesn't matter if you're up for singles or doubles, you'll love the health benefits that come along with a game of tennis. Tennis not only improves your quality of life, but it also helps you live longer, just like many other physical activities. Physical activity increases lifespan, reduces the risk of heart disease, prevents high blood pressure and reduces the risk of cancer. Research indicates that a 135-pound woman who plays tennis for 60 minutes will burn 330 calories during a round of doubles and 420 calories during singles. People who play for three hours per week cut their risk of death in half from any cause, according to the Harvard University School of Public Health. Playing tennis even helps your brain develop because it requires alertness and tactical thinking.