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Is the primary targeted musculature changed from the front deltoids? And is the overall targeted musculature changed? (From a normal one where the elbows are extended straight, the shoulders at 90deg and the body horizontally parallel to the floor to the elbows bent to nearly 90deg, the shoulders more or less in a neutral position, and the body in the same flat horizontal position parallel to the floor).

What else changes about this exercise when it is so modified?

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They both use predominantly the shoulders and a bit of chest. The main difference between a planche and a 90° hold is that with planche using straight arms, the point of contact with the floor is further away from from shoulder creating a longer lever and thus making the planche considerably harder.

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    That's not the only difference. A bent arm planche puts a lot of stress on the triceps, while a planche with locked out arms puts more stress on the biceps.
    – MJB
    Oct 10, 2023 at 9:57
  • @MJB why would that be? What are the mechanics of the shifting stress? Oct 10, 2023 at 14:27
  • Btw do the rotator cuff muscles get recruited in this at all?
    – Frank
    Oct 11, 2023 at 13:46
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    @Seekinganswers because when you have (slightly) bent arms, you're pushing to keep your arms from bending further (which is done by the triceps). When you have full straight locked out arms, you keep tension on the biceps to not let them bend further passed the straight point.
    – MJB
    Oct 12, 2023 at 6:23
  • @MJB - what you say is true but I didn't think it worth mentioning because the amount of work done by your bi's and tri's is pretty inconsequential compared to the stress on your shoulders and chest.
    – Ethan
    Oct 13, 2023 at 20:01

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