One of the fastest growing sports in America involves a court and a net. And, no, it's not tennis or badminton, it's pickleball. Yes, that pickleball, the one your grandma plays, and the one you may consider beneath your athletic pay grade. Time to rethink that.

Pickleball has had a 650 percent increase in numbers over the last six years, according to USA Pickleball Association (USAPA). The biggest subset of that growth is not in the over-60 crowd, says Justin Maloof, executive director of USAPA, but the younger set. “When the sport first caught on in the sunbelt states around 2009, it was at 55-plus centers and RV communities,” he says. “It snowballed from there. But these days, there are many municipalities and parks and rec departments that are setting up courts, making it accessible to a younger crowd.”

That’s how 49-year old Rocky Brown first learned of the sport. The Woodbine, Md., real estate professional gave the game a try through his local parks and recreation department and before he knew it, Brown was hooked. “I fell in love with it, found a league and soon was playing five days a week,” he says. “I wanted to help it grow locally, so I became the league director.”

Now Brown oversees a league that plays on multiple days per week and offers beginner, intermediate and advanced levels. The Wednesday night, intermediate league now has 120 players, up from just 30 a couple of years ago. And while there are certainly senior citizens in the league, there are plenty of middle-aged and younger participants moving around the courts as well.

A pickleball player participates in the 2017 USAPA National Championships in Arizona. Tom Gottfried / ASAPA file

What is pickleball exactly?

For the uninitiated, pickleball is something of a mix between tennis, racquetball and ping pong. Players use special paddles and a wiffle ball, and games take place on tennis courts with specific pickleball lines. Nets and court sizes are smaller than their tennis counterparts, and the most common game is doubles, although singles is also an option. It has its own set of quirky rules — for instance, try to stay out of the “kitchen”— but they’re easy to learn.

Josh Jenkins, who is Brown’s 30-year old partner and plays in professional tournaments around the country, says the game appeals for several reasons. “For one, it’s very social,” he says. “You’ll see a big mix of demographics out there.”

Another factor Jenkins appreciates is its mental component. “You need to out-think your opponent,” he says. “There’s a lot of strategy that goes into playing.”

The game is also quick, making it a convenient way to get in some exercise. Games in a typical league run only 15 minutes each — you can get in as little or as much as you want. Brown likes to go for broke. “I wear my fitness tracker when I play and after two hours, I’ve moved the equivalent of four miles of walking,” he says. “But the nice thing is that if you’re playing doubles, you can get in a workout without killing yourself.”