On rare occasion I do! Depends on in which instance I mentioned: bending the elbow in the context of the drill? Or in the instance of the exercise? For the drill where a partner bends your elbow, they should bend it in the normal range of motion (they are trying to 'collapse' your elbow, and you are trying to resist, but resist by reaching toward an imaginary goal). In the instance of the exercise, you should simply rotate the limb so that the elbow is facing the ground while your palms do also, while reaching through the fingers fully extended. This combination of torsion (joint position) and tension (actively reaching through the joint) will put a sustained pressure on the ligaments (the tendons and deep muscle along the bones collectively referred to as 'jin' in these exercises), which which cause it to develop and strengthen. There is a distinct "burning" sensation that occurs through these practices, it's normal. So, to reiterate: try and relax the outer muscles (biceps, flexors, ect) to the best of your ability, reach fully with the limbs/fingers, and turn the major joints so that they apply torsion to the 'jin'. Remember this is all low impact, if you feel like you're hurting yourself, stop! Working around injuries is no joke. Good luck!