Start: Use a very lightly loaded barbell for this shoulder warmup exercise. Stand in the finishing position of an upright row: bar at chest level in an overhand grip, forearms pointing down, and upper arms parallel to the floor.
Finish: Without moving your upper arms or your elbows, rotate your forearms until they point straight up instead of straight down. Then press the bar overhead, without locking your elbows. Pause, lower the press, then reverse the forearm rotation to return to the starting position.