Bradley Blair Osteopath on Instagram: "Did you know this about the supraspinatus muscle? For years we’ve been taught that this small muscle “initiates” shoulder abduction. It’s in textbooks, it’s in lectures, and it’s rarely questioned. But when shoulder movement is actually measured, that idea doesn’t hold up. Using EMG, Reed et al. (2013) showed that the muscles of the shoulder complex activate together at the onset of abduction, rather than one muscle switching on first to start the movement.