Per ChatGPT
Yes, pull-ups do engage the triceps as stabilizers, although the degree to which they are engaged can vary depending on your grip and technique.
When performing a pull-up, the triceps work to stabilize the elbow joint and help control the movement of the arms as you lift and lower your body weight. This is especially true if you perform a pull-up with a wide grip, as this places more emphasis on the triceps.
However, the primary muscles targeted during a pull-up are typically the back muscles, including the lats, rhomboids, and traps, as well as the biceps and forearms. The triceps are considered secondary muscles in this exercise.
That being said, incorporating a variety of exercises that target the triceps can be beneficial for overall upper body strength and muscular development. So while pull-ups may not be the most effective exercise for isolating the triceps, they can still help to improve triceps stability and strength.
