PETOSKEY — A new gym is offering kids ages 3-15 the opportunity to learn coordination, build muscle and get out of their comfort zones through parkour, gymnastics and obstacle courses. Cowabunga Ninja ...

It's nearly 8 on a Thursday night. In one corner of a vast, high-ceilinged gym, six adults are sprawled on a mat as Gerald Bartosch talks them through stretching exercises and drills. "Point your toes ...