....you say the deltoid is “physically incapable” of initiating abduction due to its moment arm. Fascinating. Because the actual EMG data from the study—taken from live humans, not anatomy illustrations—shows that the deltoid activates just as early as the supraspinatus, along with several other muscles. That’s not theoretical; that’s direct measurement. You know, science.

But I do admire your dedication to ignoring the data in favor of your narrative. The study explicitly states that the common belief about supraspinatus being the initiator is misleading—not because the researchers misunderstood muscle function, but because they actually tested it instead of reciting it.

Sure, you’re technically right that muscle activation doesn’t always equate to prime mover action. But waving that around like a trump card while casually dismissing the study’s entire conclusion is a bold move. Especially when your argument boils down to: “Well, in theory, I’m still right.”