SUNBURY, Pa. — It's open gym time at USA Ninja Challenge in Sunbury, and the kids are taking full advantage. The former Edison School in Sunbury was recently turned into a kids-based "ninja" gym.

Tiny - and not so tiny - Texans can now train like ninjas at a new San Antonio facility inspired by the reality show "American Ninja Warrior." Power Park Ninja gym has its own obstacle courses for ...