Stand up straight holding a resistance band in both hands.
Bend your elbows to 90 degrees and move your forearms apart so that they both point directly forwards.
Keeping your gaze ahead, lengthen your neck and draw your shoulder blades gently back a little.
Keeping this position, lift the arm you would like to exercise away from your side until it is approximately 45 degrees.
This is the halfway point between being by your side, and being horizontal.
Keeping your upper arm in this position, rotate your forearm up and out.
Control the movement against the pull of the band as you return your forearm to the starting position, then repeat.
Picture your arm pivoting around your elbow.
Ensure your posture and gaze remain the same throughout.