In practice, it feels a little silly to have to make jerky motions just to change the direction of your fire. (gamespot.com)
Any quick jerky motions place additional stress on your joints and increase the risk of injury. (scoobysworkshop.com)
If you find yourself having to swing or use jerky motions then perform this exercise with your knees bent 90 degrees rather than with straight legs. (scoobysworkshop.com)