I may be wrong.
It would nice if there were scientific studies to determine some of this stuff but I'm not aware of any.
So much of what we believe in bodybuilding is without scientific foundation.
Personally, I wish Santa Claus was real. That would be so cool.
Importance of mind-muscle connection during progressive resistance training
European Journal of Applied Physiology
March 2016, Volume 116, Issue 3, pp 527–533 | Cite as
Conclusion
Resistance-trained individuals can increase triceps brachii or pectarilis major muscle activity during the bench press when focusing on using the specific muscle at intensities up to 60 % of 1RM. A threshold between 60 and 80 % appeared to exist.
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European Journal of Applied Physiology
July 2017, Volume 117, Issue 7, pp 1445–1452 | Cite as
Mind-muscle connection training principle: influence of muscle strength and training experience during a pushing movement
Conclusion
Pectoralis activity can be increased when focusing on using this muscle during push-ups, whereas the ability to do this for the triceps is dependent on years of training experience. Maximal muscle strength does not appear to be a decisive factor for the ability to selectively activate these muscles