Absolutely wrong... This has nothing to do with trainability. It has everything to do with whether a candidate is physically qualified to serve as an Officer in the Navy or Marine Corps. This appears as a Qualfied or Rejected on the BGIS system; and is one of the Q's necessary to be 3Q and appointed to USNA. This is not about "showing potential", its about meeting a minimum requirement which honestly is not that high a bar. Further, as others have pointed out -- Appointment to USNA is competitive, so meeting the minimum standard may not be enough. If Admissions has two otherwise identical candidates, but one did 20 pull ups and one did 5 --- who do you think will get admitted ? Of course, I recognize there is no such thing as "two otherwise identical candidates..." but this is an illustration -- I recently attended an BGO seminar, and the Admissions rep commented that he had seen the decision come down to comparison of CFA results.
To OP -- Not trying to be negative here, but some of the advice above is good...don't look for the minimum, but train to the maximum.