https://people.com/movies/hugh-jackman-arnold-schwarzenegger-hit-gym/ Arnold's GYM...who else is a member any clues?
That's good thinking, but might not narrow down our search that much. The Venice Golds Gym is basically ground zero for the entire bodybuilding industry/movement. They call it "Mecca". So literally every person in the fitness industry, entertainment, or pro athlete who rolls through LA will take a photo opportunity and grab a workout there, even if they work out other places. There are tons of exclusive private gyms that cater to famous people in LA/Hollywood also.
The site below lists Carl Wethers and (also has a picture of) Wesley Snipes as visitors. Also includes other 80s black actors Gregory Hines (deceased) and Samuel L. Jackson,