Throwing a tight spiral can be a challenge to a lot of people, but here we're going to explain it in a few short steps.
To start off, you should grip the ball with your middle, ring, and pinky finger on the laces, your index finger near the nose of the ball, and your thumb on the underside. Although a football can be held many different ways, this grip is a good place to begin. Play around with the grip to see what is comfortable.
Once the ball is being gripped, the throwing motion should begin. It starts with taking the ball back the same as throwing any ball. Once it is back you should begin moving your arm forward, simultaneously transferring weight from your back leg to your front. The torso should torque as your arm moves forward, right up until you release the ball.
The follow through is crucial to whether or not the ball will wobble or spiral. The ball needs to be released with a flick of the wrist, with your whole hand rotating as the ball spins off. The forward motion of your arm must continue even after the ball is released.
Several factors are at play when a spiral is thrown. First off, a spiral makes it so the football is at its ideal aerodynamic shape. The tip or nose of the ball is facing forward, providing as little surface area as possible for the wind to disrupt the pass. The force of the spiraling motion also keeps the wind from interacting with the ball and keeping it moving. With spirals, footballs are less affected by the wind and air.
With that in mind, the decreased effect of the wind allows for footballs to be thrown both more accurately and further.