Write an article based on this "Extend all four fingers. Curl your fingers. Curl your bent fingers inward. Fold the thumb down."
Hold your hand out straight and naturally extend all four fingers. Firmly press all four fingers together, leaving the thumb loose.  Your hand should stick straight out as though you are extending it for a handshake. Squeeze your fingers together with just enough pressure to turn them into a solid mass. They should not hurt or feel stiff, but there should be no spaces or gaps between them. Bend your fingers into your palm, curling them under until the tip of each finger touches its corresponding base. You are bending your fingers at the second joint during this step. Your nails should be clearly visible, and your thumb should remain loose at the side of your hand. Continue curling your fingers in the same direction so that the bottom knuckles are brought out and the finger joints are tucked in.  During this step, you will actually bend the third and outermost knuckles of your fingers. Your nails should partially disappear into your palm. Your thumb should still hang loose during this step. Bend the thumb down so that it falls across the top halves of the index and middle fingers.  The exact placement of the thumb isn't too crucial, but it must be tucked under and should never hang loose.  If you press the tip of the thumb to the fold of the second knuckle of your index finger, you may actually minimize the risk of damaging the bones in your thumb. Tucking the thumb under the index and middle finger works well and is a more common tactic, but you must make sure that it remains relaxed as you strike. A tense thumb will pull the bones at the base of your hand down and apart, which may increase your risk of developing a wrist injury.