(While the picture shows a right handed player, the instructions are also applicable to left handed players.) Place the elastic loops over the third (ring) finger and thumb of the throwing hand, with the tension strap facing the palm of the hand Bend your hand forward and place the wrist strap around the arm, at or below the wrist joint, so that there is little or no stretch in the tension strap (see illustration). Fasten the tension strap tightly enough to insure the wrist strap does not slide on the arm and keeps the hand forward comfortably in the "resting" position.
Once attached, when the wrist and hand are drawn back (cocked) the tension strap and elastic straps around the thumb and finger will stretch. When the hand is braought forward, the wrist will "pop" forward. The action you are developing is to have the Trainer bring the wrist forward when a ball is thrown. This is the position the hand will be in when the throw is completed. The elastic loops will stretch when the wrist is flexed back, and "pop" the wrist forward when the ball is thrown.

Before starting to throw with the Trainer on your hand, flex your wrist forward and backward 10 to 15 times to loosen the muscles and get the feel of "popping" the wrist. This wrist "pop" is developed by using the ZIP Baseball Trainer.
Then, with the Trainer in place, throw the ball with your normal grip, bringing the wrist back as far as possible, stretching the elastic loops and tension strap as your arm moves back in your throwing motion. As the arm moves forward to release the ball, "pop" your wrist forward. Throw about 25 times with the Trainer on, then remove it and throw without it about 25 times, trying to duplicate the wrist "popping" action you feel when using the Trainer. With continued practice, improved coordination and control will develop in your throw. You will learn the proper wrist action for faster, more accurate throws.

The Trainer can be helpful off the field by keeping wrist muscles loose and trained. Place the Trainer on your hand and exercise the wrist by moving it back and forth, like you were throwing a ball, while you're watching TV, riding in the car, or just relaxing. The coaches that developed the Trainer found that with consistent practice, the Trainer can make a "good" player out of a fair player, and a "superior" player out of a good player Use the Trainer daily until you get the desired results and keep it available to bring back the ZIP when it gets away from you.

Notice: Not recommended for younger players without parents' or coaches' approval. Move the elastic straps by placing both loops on the middle finger with enough forward pull to bring the wrist inward as shown in Figure 1. (This is the "flexed" position.) Place the fingers on the laces as shown in Figure 2 with the middle finger placed firmly on the lace of the ball, with the index finger resting on the ball lightly as a guide finger. Bring the arm forward the same as the fast ball, popping the wrist toward the body as in Figure 3, "cutting the ball" to put side rotation on it. The slider from a right handed pitcher is intended to look like a fast ball until the last moment, when it moves out and slightly down to a right hand batter, or in and down to a left handed batter.