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It is best to use a cable machine with an overhead pulley and a rope or a straight bar.

Starting position- grip the bar with your hands about shoulder width apart in an overhand fashion.

Movement- Keeping your back straight and elbow stationary, push the bar down until your arms are completely extended. Then slowly bring the weight back to your starting point.

Note- Never allow the weight stack and the machine to touch.

Picture Source: Getting Stronger by Bill Pearl and Gary T. Moran, Ph.D.