Arthrokinetic reflex is defined by the way in which a joint movement and/or position can reflexively cause muscle activation or inhibition.
In any given movement an X amount of mobility is required. Some more than others, some close to nothing, and in some cases the requirements are closer to the supernatural. Where does weightlifting lay in this spectrum? In a scale between chilling in bed eating nachos and watching Netflix to getting yourself in a headlock using your own legs then weightlifting is probably somewhere in the middle. Like, being able to touch your forehead with your left foot as your itching the other foot with the left hand. What I'm trying to say is basically that the requirements are not extreme, yet, probably a tad higher than what most people deem to be average.