The community is debating the importance of arm angle during push-ups to specifically target the pectorals versus the shoulders, concluding that technique should be adapted according to the intended goal rather than being labeled as 'good' or 'bad'.

noli's read

The biomechanics of the movement confirm that arm width influences muscle recruitment. Studies (such as those published in the 'Journal of Strength and Conditioning Research') show that an elbow position closer to the body (approximately 45 degrees) engages the triceps more and reduces pressure on the shoulder joint, while a wider opening may increase activation of the pectoral fibers but potentially exposes one to joint discomfort. It is inaccurate, however, to say that 90-degree push-ups do not work the pectorals; they simply engage the upper body differently. The risk of injury (shoulder impingement) mentioned by some members is a common concern in sports science, although tolerance varies considerably from one individual to another. The community is divided: a majority supports a nuanced approach where no form is strictly 'wrong', while the original author was seeking validation for a more isolated execution. In sum, research validates adjusting technique to vary the stimulus, making the idea of a 'single correct method' scientifically simplistic.

the sources

1. 1r/bodyweightfitness