Casting directors for the upcoming Birmingham movie "Bigger" are looking for more extras, including bodybuilders and fitness fanatics, to appear in the film.

An open casting call for extras will be held this Wednesday night, Sept. 27, from 6:30 to 9:30 p.m. at 24e Health Club, 1901 Sixth Ave. North in downtown Birmingham.

The "Bigger" filmmakers held an open call this past weekend, but are still in need of more extras, Steve Lee Jones, one of the film's producers, told AL.com.

"We are particularly looking for fitness people, but we do need to cast many, many others," Jones said. "We need bodybuilders, we need the fitness crowd, and we need regular folks, as well.

"Pretty much anybody who comes out can probably get an extra spot in the movie," he added. "We need upwards of 500 people."

Bodybuilders need to be in their 20s to mid-30s, Jones said.

The movie, which spans the 1920s to the 1970s, is based on the life stories of brothers Joe and Ben Weider, who overcame a life of poverty to pioneer the bodybuilding movement and grow it into an international sport.

Along the way, Joe Weider helped develop a young Austrian bodybuilder named Arnold Schwarzenegger, who went on to win multiple Mr. Olympia and Mr. Universe titles before becoming a movie action hero.

"Bigger" stars Tyler Hoechlin from Richard Linklater's "Everybody Wants Some!!" and MTV's "Teen Wolf" as Joe Weider and Aneurin Barnard of the summer hit and early Oscar favorite "Dunkirk" as Ben Weider.

Australian bodybuilder Calum von Moger, who won the World Fitness Federation's 2015 Mr. Universe title, plays a young Arnold Schwarzenegger.

George Gallo, who wrote the screenplay for the Robert De Niro-Charles Grodin action-comedy "Midnight Run" and who wrote and directed the James Caan-Luke Wilson crime saga "Middle Men," is the movie's co-writer and director.

"Bigger" is produced by Jones and his partners Scott LaStaiti and Camila Castro, Jones said.

Filming will take place in locations around Birmingham and in Mobile beginning Oct. 9 and continuing through mid-November.

For more information about becoming an extra, go to the Marinella Hume Casting Birmingham Facebook page.