The Sun Gym Gang was composed of bodybuilders (including Daniel Lugo and Adrian Doorbal) who worked out at Danny Lugo’s Sun Gym in Miami Lakes, Florida in the mid 90s. They were responsible for the murders of Frank Griga and Krisztina Furton as well as the kidnapping, extortion, and attempted murder of Marc Schiller. The crimes were later adapted into Pain & Gain, a 2013 film directed by Michael Bay.
Sources:
Pain & Gain True Story vs. Movie – Real Daniel Lugo, Paul Doyle (historyvshollywood.com)
How Danny Lugo’s Sun Gym Gang Killed Frank Griga and Krisztina Furton | Crime News (oxygen.com)
Pain & Gain: the true story behind the movie | Movies | The Guardian
Pain & Gain | News | Miami | Miami New Times | The Leading Independent News Source in Miami, Florida
Muscle and mayhem: The real-life story behind Miami’s murderous Sun Gym gang – CBS News
(261) the Real-Life Sun Gym Gang Muscle and Mayhem – YouTube