Assisted Dip
The dip is a key vertical pressing skill, but the full version is hard — so you start with assisted or partial versions to build the strength and, crucially, the shoulder stability to do it safely. The first step is simply owning the top support hold on parallel bars: arms locked, shoulders down and stable.
FilmableFilm this on your phone and TrueForm measures your body mechanics and tells you what to fix. You get angles, not a made-up score.