There are so many moves to choose from in basketball. Everyone seems to want to learn/teach a million different ones. It's important to develop a small package of moves/counters to go to as a bigman or bigman coach.
One move that seemed to have gone away for some reason is the one legged running hook. A long time ago a Hall of Fame Center named Kareem Abdul-Jabbar perfected a one legged running hook called "the skyhook". It was an unstoppable move by a long armed 7'2 center that could elevate and create separation with his body fending off defenders while bringing the ball up and behind his head to elevate a soft shot and extend over his man.
The shot was one that was in every elite big man's package until it started to go away for some reason. Most big men will go to a two footed jump hook to replace the running/sky hook. Now a few big men and wing players use the move in today's game. Tim Duncan, Pau Gasol, Marc Gasol, LeBron James, and LaMarcus Aldridge are all big men in today's game that have perfected the move.
Just like anything else the shot will be more comfortable the more reps a player performs. They can start with jus a no dribble one long step skyhook with their strong hand. Get them used to the last step and shooting the ball with it. I would say 100-150 reps before they start to come around. Like a jumpsuit make sure all 5 fingers on the release are facing the rim, and make sure thy have a soft high arc so the ball can hit the rim softly and give some bounces.
Here are some video's breaking down the move.
Start with having your player on the left block facing the paint. Line them up on the lane line facing the paint just inside of the dots. Have them take one step with their left leg catch the ball and shoot the right handed baby hook. This will get them used to finishing the hook.
Make sure that they don't dip the ball when they catch it. They should catch chest level and bring the ball up to the hook.
When they are comfortable with the one step hook move them out and take the 2 steps with no dribble, again this will work on their coordination with the move to shoot the 2 step baby hook. Same thing have them keep the ball high and shoot the ball on the highest point of their jump. Have them step right leg first then left foot and up to the hook.
To finish the teaching of the move from a face up position step with left foot and dribble at the same time and then step right then left and up with the right handed hook.
If they mastered the 1 and 2 step hook with no dribble and then the dribble 2 step hook going middle you can add it to a post move.
Start with the catch on the left hook with their back to the basket. Have them face up and keep the ball high shoot the bank shot. Once they are comfortable with that shot add the running hook. They should be opening up with an inside pivot to the baseline.
The last part of this is the open up to the baseline, drive middle take a dribble and step left/right/left and shoot the running hook.
REPEAT ON OTHER BLOCK USING LEFT HAND AND OPPOSITE LEGS
Good luck with your teaching and let me know how it goes.