Both have played soccer before but throw-in's have not been incorporated into games at this level in the leauge they play in. Both can do a standing throw-in from practicing at home. This was their first attempt at a moving throw-in.
When getting ready to take a throw-in you want to stand outside of the field, just over the touch or sideline. You should be facing the direction you want the ball to go in. The ball will be centered in front of you about waist high, between both hands.
During this phase you will take your steps toward the field. It can be as many steps as you would like it to be but shouldn't be less than two. As you get closer you start to raise the ball.
As you approach the sideline you will come to an abrupt stop. You will continue raising the ball until you bring it back as far as you can behind your head.
While keeping the ball centered, you will bring the ball forward back over your head. When your arms get to about ear level you will extend your arms at the elbow all the way and release the ball. It is important to remember that you cannot step over the touch line and both feet need to be on the ground when releasing the ball. Be careful to bring both arms down at the same time and keep hands level so you don't put any twist on the ball.