Gainz

Gainz is a manufacturer of weightlifting equipment. Its name comes from the bodybuilding slang term "gainz."

The brand first appears in Grand Theft Auto Online as a minor sponsor on vehicle liveries introduced with the Arena War update, including the "Ammu Nation" livery for the Deveste Eight.

In Grand Theft Auto VI's second trailer, Jason Duval uses Gainz weight plates while lifting at an outdoor gym in Vice Beach. The visible plates are green 10 kg, black 15 kg and blue 20 kg.