What does push ups build?
Triseps and chest depending on how you do them. The closer your hands are the more chest muscle it works and vice versa.
Definitely also doing triceps pumps by putting your palms on the edge of the couch and dipping down really helps. Pulls ups build forearms and biceps and push ups build forearms and triceps. Also very good for the chest and back . Yes push ups are used by all Special Forces training and is a big component in Michael Phelps Olympic swimming training program.