First, though, a word of caution. As Steven Salzberg, a Johns Hopkins professor of biomedical engineering, wrote in Forbes, “This was an observational study, based on surveys of people’s behavior over a 25-year span...It might be that people who play sports are generally healthier, and that leads to longer life and allows them to play more sports.”
It may also be that the socioeconomic backgrounds of tennis players are just as important to their health as the sport they play. Tennis has traditionally attracted an upper-class clientele, and greater longevity is increasingly correlated with greater wealth in the United States.
Taken together, though, the British and Danish studies suggest a pattern, one that came as something of a surprise to their authors, who wondered: Why tennis? While the sport is not as aerobically taxing as some others, it has benefits that are both physical and emotional.
For one, the Denmark study’s authors speculated that tennis’ quick-burst, anaerobic workouts may have lasting advantages.
“Short, repeated intervals of higher intensity appear to be superior to continuous moderate physical activity for improving health outcomes,” they wrote.
Tennis also forces its players to exercise a variety of muscles in the upper and lower bodies, while at the same time taking less of a physical toll than running.
Emotionally, tennis has something that no other solo activity can offer: a built-in social component. It turns out that in trying to pummel your opponent into submission—all in good, friendly fun, of course—you may be helping your own psychological well-being.
“Belonging to a group that meets regularly promotes a sense of support, trust, and commonality” the Denmark study’s authors noted, “which has been shown to contribute to a sense of well-being and improved long-term health.”
In tennis, players work out strategies, either on their own or with doubles partners. They engage others competitively and cooperatively. They form new social groups off the court where the stakes are lower and less stress-inducing than they are in their work and home lives. The circumscribed, leave-it-all-on-the-court competition we get from tennis allows us to escape from the real competition we face in our day-to-day lives.
“For both mental and physical well-being and longevity, we’re understanding that our social connections are probably the single-most important feature of living a long, healthy, happy life,” Dr. James O’Keefe, a cardiologist at St. Luke’s Mid America Hospital in St. Louis, and one of the Denmark study’s co-authors, told Time last fall. “If you’re interested in exercising for health and longevity and well-being, perhaps the most important feature of your exercise regimen is that it should involve a play date.”
“Any exercise is better than none,” O’Keefe said, “...but when our physical activity also allows us to play, it basically magnifies the benefits.”