Hello!
If you are talking about the photo that I think you are referring to, that is actually an isometric movement that Bruce Lee is doing on the power rack. He is creating his own resistance by pressing upward with the top of his wrists against a padded bar that cannot move. I do this often myself, and it is great for the forearms!
Keep Blasting!
Sifu Lamar M. Davis II
Senior Instructor
Hardcore Jeet Kune Do
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