The $30B a year fitness industry is running on high speed, with growth projections through 2020. Fueling that number, a wave of fitness chains have been tearing through local markets, leasing rather than buying real estate. Here are 7 major chains to watch for. Begin slideshow

1. Planet Fitness Wikimedia/Anthony92931 Locations: Over 773 Stores opened last year: 146 Headquarters: Newington, NH The New Hampshire gym chain sold 9.1 million shares in its IPO back in July. Its success can be attributed to its crazy-low prices—we're talking $10 a month, no commitments, a far cry from the industry's common $100 rates—and a no judgment-zone atmosphere.

2. Anytime Fitness Wikimedia/Mtaylor848 Locations: 2,463 Stores opened last year: 120 Headquarters: Woodbury, NY With franchises in over 19 countries—such as the Grand Cayman, Poland and Qater—this gym rose to the top by keeping its doors open 24 hours a day for 365 days a year.

3. Pure Barre Flickr/North Hills Locations: 300 Stores opened last year: 93 Headquarters: Spartanburg, SC Pure Barre isn't a giant room with treadmills and weights but instead a studio franchise that features a ballet-like workout with moves such as squats and lunges. The new workout style gained fast popularity and just broke into Canada this past summer with plans for its first Toronto location.

4. 9Round Facebook/9Round Locations: 167 Stores opened last year: 84 Headquarters: Greenville, SC This kickboxing studio successfully branded itself with its trademarked nine-station routine, allowing it to branch out into Mexico, Australia, Canada and soon the Middle East.

5. Orangetheory Fitness Facebook/Orangetheory Fitness Locations: 108 Stores opened last year: 72 Headquarters: Ft. Lauderdale, FL This boutique studio chain's flagship location was obviously in New York's trendy Chelsea neighborhood. It's high-tech strategy is to offer a heart rate monitor to every customer along with interval training.

6. Title Boxing Club Facebook/Title Boxing Club Locations: 135 Stores opened last year: 32 Headquarters: Overland Park, KS Started in 2008 by former professional boxer Danny Campbell, the nation's largest boxing franchise grew over 1,700% over the past three years with classes designed to help participants burn up to 1,000 calories.