BusinessTN

The RUSH Fitness Complex opened its first two health clubs in Knoxville in 2001 and now operates 19 clubs in Tennessee and North Carolina. The RUSH doubled its annual revenue between 2006 and 2008. Though revenue will continue to grow as newer clubs mature and the economy stabilizes, adding new clubs is the company's primary revenue driver. It recently opened two fitness centers in the Asheville, N.C., area and hopes to continue to add clubs to The RUSH family in the future.

While selling electric fencing (for horses and cattle) to farm and feed stores in the Southeast in the early 1980s, Randy Boyd began receiving inquiries about a product called Invisible Fence. When he discovered that the product was only sold through franchise dealers, he invested more than his net worth to create a radio fence of his own and founded Radio Systems in 1991. Today, Radio Systems, which employs more than 350 people worldwide and sells more than 900 products, is one of the largest pet product manufacturers in the United States. With brand names such as PetSafe, Sport Dog and Invisible Fence (Boyd now owns the company that introduced him to that initial product), Radio Systems' products include bark control systems, pet doors, pet identification collars, pet feeders, and, of course, electric fences. With the non-food pet products industry expected to reach $15 billion by 2011, Radio Systems is set to ride the wave.