A spike ball hit is when your hand is open and you hit the ball (hard) to the other side.
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I'll answer part of that question. The position of the HAND and thumb is critical. You fingers should be closed and your hand should be cupped a little. Your THUMB should be held so that it partially curls over the top of the middle knuckle on the index finger of the hitting hand. I'll let someone else answer the arm mechanics, but just doing that with the hand makes a BIG difference on the velocity of a kill shot. It seems to make it really POP.
Also, FYI, this is ALMOST similar to the way you want to hold your hand when you serve if you have a standing serve. When you learn to toss the ball up correctly, and learn to hit the ball so the valve is pointed exactly where you want to hit it, (e.g. you should be able to draw a line that starts in the fleshy part of the palm where it meets the base of the fingers; and that line should be drawn on a straight line so that it goes exactly through the valve on the opposite side, and ends where you are aiming), you will find that the ball will move like a knuckleball thrown by a Baseball pitcher. Essentially, it moves not in a straight line, but will stray off the line you established by 2 or 3 inches. If you hit it with the right velocity, it will just dive much earlier than than your opponent anticipates. And....even if he is right there, it won't hit him as squarely in his/her forearm cradle, often resulting in a bounce that is unpredictable. Remember the, KEY is to hit the ball straight with your arm going almost straight through so you don't impart spin. Don't snap your wrist down, or you will impart spin, and therefore negate the effect of the knuckleball affect. It's really fun to serve this way - you don't have to take a running start and jump and hit the crap out of it . You can essentially stand just outside the back line, toss it the right way, and watch the ball move. Disclaimer, I'm 6'2" so I find that I'm tall enough to do that. If you are short, I'm not sure how it will work. If you keep your hand cupped, you can get some good speed on it too and aim it lower - to a point that is just above the net - assuming an opponent isn't standing right there. I like the part where the other guys look at each other and say "I thought YOU were going to get that."
I've tried to explain this to others, but they just have to keep trying if they get it right. They will learn the serve within 15 or 20 practice shots if they are decent players to begin with. As far as the spike instructions above, It works better when I SHOW them. Maybe I'm just not good at explaining some of the small things that may be natural to me, but not them. Anyways, give it a shot.
A spike ball hit is when your hand is open and you hit the ball (hard) to the other side.