For a big man scoring in the high post can be a really good tool. If they are able to flash hard to the high post, and get a catch as the defender is still closing out, it puts the defender at a disadvantage. Big men are not use to closing out, and most likely don't have the best footwork.
That is why this jab step shot move can be so effective, if learned and done the right way. This basketball drill is going to simulate a game situation shot where a post player is going to flash up from the opposite post, get a catch, jab step the defender, and then shoot the ball. It takes pretty good footwork to use this move, but once learned it can be deadly.