London-based Mahny Djahanguiri this summer published a book called ‘Doga: Yoga for you and your Dog.’ She advises human yoga practitioners to go about their poses while their dogs sniff and frolic, waiting for the pooches to calm and approach them. Dogs sometimes wander for 60 minutes of her 90-minute classes, she says.

Brandi Freeman felt guilty leaving her dog in her Jersey City, N.J., apartment while she went to the gym. So on a recent Saturday morning, the 27-year-old high-school chemistry teacher met a half-dozen other owners and their dogs in Brooklyn’s Prospect Park.

Ms. Freeman sprinted, did squats and raced through an obstacle course set up by the class operator, a company called Go Fetch Run—all with her Shih Tzu, Franklin, panting by her side on a leash.

A 5K runner
A 5K runner

“He loved it,” she says. And she had sore muscles the next day. “I guess being distracted by him a little bit, I didn’t realize how hard we were running up and down the hills.”

There have long been health clubs for people and agility classes for dogs. Increasingly, people are crossbreeding the two and working out with their pets.

“If you have certain dogs, like we have a border collie, you really need to exercise them,” says Sue Foster of Denver-based Iron Doggy, which sells special leashes that fasten to an owner’s waist. “It just makes sense to kill two birds with one stone.”

Nearly 53% of dogs in the U.S. are overweight, according to the Association for Pet Obesity Prevention, along with 69% of humans. Dog owners are more physically active than nonowners, an analysis in the Journal of Physical Activity & Health found. But some people aren’t satisfied with mere rambles to the dog park.

See Dogs Kayak and Do Yoga

People practice yoga, do push-ups and paddle with their four-legged friends.

Colleen Campbell, right, and her daughter Skyler Sloane work out in the Bonding with Bootcamp class at Leash Your Fitness in San Diego.
London-based Mahny Djahanguiri this summer published a book called ‘Doga: Yoga for you and your Dog.’ She advises human yoga practitioners to go about their poses while their dogs sniff and frolic, waiting for the pooches to calm and approach them. Dogs sometimes wander for 60 minutes of her 90-minute classes, she says. RUTH JENKINSON
Suzi Teitelman Arab with her cocker spaniel, Coali, during the filming of one of her DVDs that promotes practicing yoga with four-legged companions. DOGADOG
Suzi Teitelman Arab with her cocker spaniel, Coali, during the filming of one of her DVDs that promotes practicing yoga with four-legged companions. DOGADOG

Physician Cathy Hardalo takes her three dogs—one at a time—to exercise classes at area parks offered by San Diego-based Leash Your Fitness. The classes attract “everything from Great Danes to little seven-pound Yorkies,” she says.

Suzi Teitelman Arab with her cocker spaniel, Coali, during the filming of one of her DVDs that promotes practicing yoga with four-legged companions.

One exercise, puppy push-ups, requires the dog to sit, lie down then pop up on command. The owner subtracts every puppy push-up from her assigned 20 or 30 human push-ups.

“Marcy at her best could do 13,” Ms. Hardalo says of her border collie/Labrador mix. There may not be towel service in class, but “there’s an endless supply of poop bags,” she says.

Leash Your Fitness also offers outdoorsy human-dog excursions like hiking and stand-up paddling. A few years ago, Jill Fernandez and her husband, of Long Beach, Calif., joined a flotilla of a dozen kayaks with people and pooches in San Diego’s Mission Bay. The couple and their two dogs were nestled in a large kayak when Annecy, their black Lab, leapt at a swooping pelican and capsized the vessel. Thanks to life vests all around, both humans and canines survived.

Noelle Blessey, co-owner of Thank Dog! Bootcamp, which has 10 licensed operators in the U.S., recalls leading a class in a Burbank, Calif., park a few years ago. An owner set down a dog’s leash and her chow/husky mix bolted after a squirrel. Two other dogs followed, and all three of them ended up “literally barking up a tree,” Ms. Blessey says.

Anthony Corriveau and his wife, Shannon Johnstone, have twice run the Dirty Dog 15K Trail Run in Charleston, W.Va., with their three rescue dogs (left to right): Dudley Dooright, Jeffrey Jeffrey and Jorge Francisco. Here, Mr. Corriveau and the dogs finish the 2013 race. Dogs are credited with their owners’ finishing time.

Suzi Teitelman Arab has been teaching yoga to dogs and people for more than a decade. She sells her Doga Dog DVDs to people around the world from her Jacksonville Beach, Fla., home, and says her five pups line up to do poses with her such as, yes, upward and downward dog.

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“We do a lot of gazing, just looking at each other, doing meditation that way,” she says.

In May, 400 people and 110 dogs registered for the Dirty Dog 15K Trail Run in Charleston, W.Va. Given how the number of participants had multiplied over the race’s 11-year history, the competition evolved from casual trot to dogfight.

“The first year, a Jack Russell Terrier won it,” says Daniel Todd, who co-directs the race with his wife, Tracey. “Now, it’s usually won by running breeds—German Shorthairs, Weimaraners.”

Owners must keep their dogs within sight and are credited with the human’s finishing time. All dogs get home-baked treats; human winners get a set of dog tags.

“My wife and I, we don’t have any children, so that’s our pack,” says Anthony Corriveau, a software engineer from Cary, N.C., who has twice run the race with Shannon Johnstone and their three rescue dogs. The couple’s best long-distance runner is a Lab mix with three legs.

Nationwide, races that allow people to compete with their dogs have grown 24% this year from 2013, according to event-management firm and data provider Active Network. Most of the races are five kilometers, or a little more than 3 miles.

Brenda Swanson does puppy push-ups with her dog, Sunny, in a recent Leash Your Fitness class in San Diego. The dog goes first, sitting, lying down then popping up on command. For every successful puppy push-up, the owner subtracts one push-up from her assigned 20 or 30.

In September, Laura Baune drove nine hours from Lacey, Wash., to The Resort at Paws Up, a vacation spot 35 miles northeast of Missoula, Mont., to run the Canine Classic half-marathon with her border collie/Lab mix, Barkley.

“He probably ran a marathon while I ran a half-marathon just because he was going back and forth as I ran,” Ms. Baune says.

USA Track & Field, the sport’s governing body, hasn’t sanctioned races that allow dogs on the course for at least a decade, in part due to liability claims of runners tripping over dog leashes, a USATF spokeswoman says. That means no top dogs: Human runners can’t set national records or qualify for the Olympic trials without the organization’s sanction.

The MVA Superhero 5K in Valley Forge, Pa., on Oct. 17 included dogs dressed as superheroes and people dressed as dogs.

Angi Aramburu, founder of New York’s Go Fetch Run, is working with a lawyer to license the two-year-old business.

“I always say it’s the only class where you’ll get a kiss while you’re doing ‘plank,’ ” she says.