Scientists are helping coaches, keepers and penalty takers minimize the randomness of penalty kicks, which are the key to success in tournaments.
A penalty-taker will try to disguise where he is going to kick the ball. But it’s hard to hide one’s intentions completely. In the fraction of a second before they kick the ball, penalty-takers can betray themselves with the angle of their kicking foot, or by how they plant their standing leg. A good goalkeeper, perhaps instinctively, seems to know this.
Once a penalty-taker’s standing foot hits the ground, a goalkeeper has about half a second to decode the clues from leg positioning, come to a decision about which way the ball will go, and get there. Simple.
overstated 
I’ve said that least 3681540 times. The problem this like that is they are just too compilcated for the average bird, if you know what I mean