When WebBall first heard this term, 'scapular loading', it was from Paul Nyman. For all we know he invented it. As kineisiologists point out, there is no such term in medicine; bones (which is what the scapula is) don't 'load', muscles load. That's the usual argument. But in engineering, for instance, static objects do 'load' - take a strain. If you want to refer to this as trapezoid tightening and pectorals flexing, go ahead. Given the complex interactions of all muscle groups around the upper body, that's equally and overly simplistic. 'Scapular loading' has become the accepted shorthand.