Diagonal shoulder extensions with resistance ("PNF D2 UE" Shoulder strengthening with band held high, in standing; 01)

Stand holding a resistance band in both hands.
Lift your good arm to the side.
Take the symptomatic arm towards the opposite shoulder, gathering some resistance as you move and keeping your thumb facing upwards.
Pull against the resistance band, taking your arm down and out and finishing the movement with your arm straight and facing diagonally downwards with your palm facing forwards.
Slowly return to start position and then repeat.