Club Industry's Viral Fitness News highlights recent popular stories about the fitness industry circulating on social media. Do you have news to share with us? Send your news, tips or story ideas to pr@clubindustry.com. You can also connect with us on Facebook, on Twitter @clubindustry and on LinkedIn.

Former NFL player LeCharles Bentley has filed a trademark infringement lawsuit against NBC over "The Biggest Loser," according to TMZ. The former Pro Bowler alleges similarities between the logo used for the show and his O-Line Performance company logo trademarked in 2013.

JK Simmons is putting a lot of people to shame. The 61-year-old actor is working out at Gold's Gym in Los Angeles and creating a lot of waves on Instagram where his trainer, Aaron Williamson (a U.S. Marine and actor), has been posting pictures of Simmons as he gets buff for what some people have speculated may be his role as Commissioner Gordon in the movie "Justice League."

Canadian ultrarunner Dave Proctor set two world treadmill records on a Cybex treadmill May 28 in Calgary in a charity fund raising effort, according to Runner's World. He ran 86.48 miles in 12 hours to beat the 12-hour treadmill record set earlier this year, then went on to beat the 24-hour record by just over one mile with a total distance of 161.81 miles.

A woman injured while participating in a SoulCycle class in California has filed a negligence-based lawsuit naming the company, the class instructor, the Beverly Hills studio and up to 30 yet-to-be identified individuals as defendants. The complaint filed by Carmen Farias' attorneys can be viewed at the link above.

Take a look inside 5th Street Gym in Miami, Florida, where Muhammad Ali began training after winning a gold medal in the 1960 Rome Olympics as Cassius Clay. Ali died at age 74 on June 3. From the New York Daily News.

Blogilates founder Cassey Ho, who fused Pilates with pop music in 2009, recently sat down with CNBC for an interview to talk about her success. Ho's YouTube channel has more than 3 million subscribers. Her secret? Make exercise less about the reps and "more about having a good time."

Kevin Schroeder of Clintonville, Ohio, lost 102 pounds in five months with the help of Life Time Fitness trainer Jack Skaggs, according to the Columbus Dispatch. Schroeder gained fame in the hockey community and on the internet over the years at Columbus Blue Jackets games as "Dancing Kevin." He would often take off his jersey during the game to the delight of fans.

Dallas Mavericks superstar Dirk Nowitzki was eliminated in a game of knockout by Sarah Nab, 9, at the Mavs Basketball Academy Hoop Camp at the Life Time Fitness in Allen, Texas on Tuesday. The Dallas Morning News shared photos of the event.

A man on an elliptical machine at an Anytime Fitness in Auckland, New Zealand, watched through the window as a woman drove away with his car while he worked out, according to a Newshub report. The woman took his keys from a board near the front desk at the gym, which does not have lockers, and the theft was captured on video. The car was later found with severe damage. No one has been charged yet in the incident.

A Virginia man attempted to break the Guinness World Record for most burpees in one hour on May 28 at the Gold's Gym in Henrico, Virginia. Josiah Beasley completed 1,436 burpees in the hour to set a new U.S. record but fell short of the 1,840 burpee world record set in 1994, according to a WWBT report.

The Bannatyne Group's Tower 42 club in London has come under scrutiny from the Daily Mail newspaper. A club employee was caught on video allegedly refolding and reissuing used towels for its upscale clientele, according to a May 24 report. The ceiling above the club's pool caved in in a separate incident, and the footage was caught on video, according to a May 28 report.

Shaun Smith, an off-duty New York State trooper, helped rescue a 12-year-old-boy from a potential drowning at the Northwest YMCA in Lysander, New York, according to a Time Warner Cable News report. Smith called the rescue a team effort with another 12-year-old boy, the lifeguard, two women and emergency medical technicians.

A lifeguard at the Miami County YMCA in Monroe Township, Ohio, rescued a 6-year-old boy from a potential drowning on June 6, according to WHIO-TV. The lifeguard pulled the boy from the bottom of the pool after nearly 10 seconds, administered CPR, and the boy was accompanied to the hospital by his father.

A girl of an unknown age saved a 6-year-old girl from a potential drowning at the Dunn-Marquette Recreation Center in St. Louis on Tuesday, according to a KMOV report. The 6-year-old girl had wandered away from her family when the other girl found her and pulled her out of the water. The girl was listed in critical and unstable condition at the time of the report.

Aspire Fitness, Lexington, Kentucky, donated a special bike to a 17-year-old girl with Cerebral Palsy on June 9, according to WKYT. Andrea Greathouse and Josh Bowen heard of Rachel Napier's story and gave her the specially designed bike. The fitness center operators said they hope to donate at least one bicycle each year to a child in need.