Sorry it took me a while to reply:
As Transplant said, find the right positioning for your lower arm. If you can't find a spot to practice shooting, you can just place the stick on the ground (so that the blade makes a 45 degree angle with the ground) and move your lower hand around while lightly pushing the stick against the ground. In some places it should flex easier than others, whichever spot feels the most comfortable, remember it or mark it. Then remember to keep your hand there, bend your knees, and hit the ground a few inches before the puck so that the whiplash sends it flying. Also be sure to follow through, or the shot will not lift. Another note, you do not need to raise the stick to the sky on your swing, stop when your second HAND (not arm) is in line with the corresponding shoulder. Good luck and keep practicing.
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