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Viduus, I also have proof backing up my claims:
"...the anterior deltoid...are more proficient at performing shoulder flexion rather than horizontal adduction...
...Consequently, the contribution of the clavicular head and anterior deltoid during horizontal adduction (the horizontal bench press) would have been limited, thus placing greater force demands on the sternocostal head of the pectoralis major. These greater force demands may account for the highest activation levels of the sternocostal head occurring during the flat bench press..."
1. Delts suck at doing adduction° during flat bench
2. The sternocostal head, which you target by getting the stretch at your pec's insertion point, is activated MORE by doing what I told you to do.
3. Your pectorals will be the chosen, activated muscle due to #1 and #2 above.
°adduction=portion of bench press where you lift the dumbbells up from the bottom, where you get the stretch
Source is:
An Electromyography Analysis of 3 Muscles Surrounding the Shoulder Joint During the Performance of a Chest Press Exercise at Several Angles
https://journals.lww.com/nsca-jscr/...lectromyography_Analysis_of_3_Muscles.31.aspx
"...the anterior deltoid...are more proficient at performing shoulder flexion rather than horizontal adduction...
...Consequently, the contribution of the clavicular head and anterior deltoid during horizontal adduction (the horizontal bench press) would have been limited, thus placing greater force demands on the sternocostal head of the pectoralis major. These greater force demands may account for the highest activation levels of the sternocostal head occurring during the flat bench press..."
1. Delts suck at doing adduction° during flat bench
2. The sternocostal head, which you target by getting the stretch at your pec's insertion point, is activated MORE by doing what I told you to do.
3. Your pectorals will be the chosen, activated muscle due to #1 and #2 above.
°adduction=portion of bench press where you lift the dumbbells up from the bottom, where you get the stretch
Source is:
An Electromyography Analysis of 3 Muscles Surrounding the Shoulder Joint During the Performance of a Chest Press Exercise at Several Angles
https://journals.lww.com/nsca-jscr/...lectromyography_Analysis_of_3_Muscles.31.aspx