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This movement mainly trains triceps, and also recruits Rear delts.
The close grip shifts work from the chest to the triceps without leaving a heavy compound movement. It is how you load the triceps with weights no extension allows.
Six to ten reps. Hands at shoulder width, no narrower: a very narrow grip strains the wrist and gives the triceps nothing extra.
Letting the elbows flare on the way down. It becomes an ordinary bench press, with a grip that no longer does the shoulder any favours.
The variants REPWIND's catalogue carries, under the name the app shows:
The journal, the anatomical map and all 257 catalogue exercises — free to start.