Accuracy and timing are the two key factors for a perfect line-out throw.
Any player in the team can throw the ball into the line-out, but usually it is the hooker who takes the responsibility.
A reliable throw can sometimes be the difference between winning and losing a match, so it's important to practice the technique thoroughly.
The first thing to do is get your stance right to establish a good foundation.
For a right-handed thrower, point your right foot forward with your left leg slightly behind.
With your body pointing towards the line out, shift your weight on your right foot, with your knee slightly bent, ready to move forward.
Listen out for the call - usually one of the jumpers or the scrum-half will shout a pre-arranged code which will determine where the ball should go to.
Ensure your grip is comfortable, otherwise the ball will not go straight or find your target.
For a right-handed thrower, the right hand should be near the back of the ball, while the left hand should be in front of it.
The right hand provides the power, while the left hand gives the direction.
Bring your arms behind your head, with your elbows fully bent, close to your head.
Your weight should be forward, ready for the throw.
When the ball is released, roll the left hand so the ball spirals in a controlled way.
This will help the target gather the ball easier.
The path of the hands should follow a smooth arc rather than a quick snap.
As you follow through, point the hands towards the intended target with your weight transferred onto the front foot.