Set-up: Establish a tall, braced posture, with a towel or other suitably long, flexible and sturdy material held firmly with both hands.
Movement: From a strong, stable base lift the working arm to the side and away from your body. Angle the upper arm slightly in front of the body (which will place it more in line with the shoulder blades and reduce the stress on the shoulder capsule). Raise the arm to parallel with the floor, hold and return. Do not use momentum, and maintain control both while raising and lowering.
Emphasis: Don't let the elbows drop below the wrists as this will shift the emphasis of the exercise from the lateral head of the deltoids to the anterior head. If the exercise is too hard, resistance from the towel may be removed, while if the exercise is too easy more resistance can be carefully applied using the other arm.
