This hits both major functions of the supraspinatus, first few degrees of abduction and external rotation.
Pushout on the band and slightly rotate your thumbs out. The trick is when you push out on the band to make your elbows come away from your sides. We’ve been taught to suck our elbow into our side when doing ext rotations. These work better if you get your elbow to come away from your side a little bit when you pushout against the band.
Do these for high reps or time. I did 4 x 100. Honestly, Wtf is 3x10 going to do for you?