"Stephen suffered a leg injury earlier in the year," said Stephen's mom, Lori Zimmerman. "The injury forced him out of play this past summer and he was pretty upset by it.
"The good news is he's back and ready to go. He worked hard to recover, so I'm happy for him that he can get back out there and play the game he loves."
Although Zimmerman wasn't able to work on his skills the way he would like to, he knows the strengths and weaknesses of his game.
"Right now, I think the things Stephen excels at are his fluidity in the open court and keeping solid fundamentals in the post," Lori Zimmerman said. "He needs to improve his strength, which he's trying to do through resistance training. We don't want him lifting weights because he could still be growing and we don't want to stunt his growth."
Zimmerman is being recruited hardest by two Pac-12 powerhouses.
"I would say Arizona and UCLA have been showing Stephen the most attention," Lori Zimmerman said. "Stephen loved his trip to Arizona. He got to check out the campus and the facilities and see what everything is about.
"Everyone made him feel really welcome down there and he couldn't say enough about the trip. The coaches were trying to get him down there for awhile and he's certainly happy he got to go."
Zimmerman has also visited UCLA and came away impressed with the Bruins.
"He also went on a trip to UCLA and he had a good time," Lori said. "He checked out the campus and the renovations and just got a better feel for the school."
Zimmerman's recruitment figures to play out over the next year or two.
"I doubt any decision will be made for quite sometime," Lori Zimmerman said. "We haven't even talked about it and there is a lot more we need to figure out before we come close to making a decision."