ABC News' Mary Pflum reports: Early in the morning, while most humans and their pets are still in bed, a few brave souls start the day with boot camp.

They are not just pounding the pavement with two legs, however, but with many more, three or four to be exact.

They are taking part in Thank Dog! Bootcamp, a training program for dogs and their owners that has expanded to locations nationwide.

"We have aggressive dogs. We have overweight dogs. We have little dogs. We have dogs with three legs," Jill Bowers, the program's co-founder, told ABC News.

(Photo Credit: Bill Cunningham/ABC News)The program, now in cities from Boston to Chicago to Los Angeles, provides a one-of-a-kind fitness training program that allows dogs and their owners to work out alongside one another for an hour at a time.

"It's sort of killing two birds with one stone," Bowers said. "No matter what, you need exercise. A dog needs exercise and obedience training so they come every day."

The idea for Thank Dog! Bootcamp was born in 2007 after Bowers began working out at Barry's Bootcamp, a California-based workout program popular with celebrities like Kim Kardashian. Bowers then had the idea to partner the company she already owned, Thank Dog! Training, Southern California's leading dog obedience training company, with a Barry's-like boot camp regime for owners and dogs alike.

"When people sign up for boot camp, they don't leave because it becomes more of a lifestyle than anything," Bowers said.

Bowers and her business partner at the time got the idea off the ground and, in 2009, Bowers partnered with Noelle Blessey, a personal trainer and boot camp instructor, to bring the boot camp portion of obedience training to life.

Blessey took " Good Morning America" special correspondent Cameron Mathison through the paces of a typical 60-minute Thank Dog! class, which range in price from $10 as part of a package to $25 for a single class.

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Yoga and Boot Camp Go to the Dogs