Fizdale gets creative to break Mitchell Robinson’s bad habits

Mitchell Robinson and David FizdaleCLEVELAND — If David Fizdale is doing push-ups on the Garden sidelines during a game, you’ll know rookie shotblocking center Mitchell Robinson has improved his defensive posture.

Fizdale has a fun bet going with Robinson, the Knicks second-round project who has been plagued by foul trouble. Robinson’s problems, according to the coaching staff, stem from keeping his hands low and picking up unnecessary reach-in fouls.

So Fizdale has made it a contest.

“We got a little thing now where you guys will catch me sooner or later, but if he doesn’t do the foul where his hands are down, I got to do push-ups,’’ Fizdale said. “And if he does [foul with his hands down,]…