Place a small Loop Band around a high point of connection and get in position below this point, neither forward nor backward.
Grab the band firmly with your right arm and place your left hand open in front of your right shoulder (see video).
Extend your arm with an arc motion.
Contrary to what is usually suggested, it is better not to lock your elbows to your torso in this exercise.
8/10 x 2/3 sets
Opening your elbows outwards, leaning your shoulder forward, not completing the elbow extension.
Further information in this article.