Range of motion is a very important factor to consider for shoulder training. On any pressing motion, I recommend lowering down to a 90 degree elbow bend and no lower. The only exceptions to this rule would be if you were an athlete, using light weights, or had completely pain free shoulder movement. When doing chest flies of any type, I would not lower down further than arms parallel to the floor. This should help prevent excessive strain on the shoulder joint and rotator cuff muscles. If full range of motion is bothersome on any shoulder exercise, I would recommend doing partial range of motion instead of completely avoiding the exercise.
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