Kids are Tops Sports Center in Centerville recently rolled out its Ninja Kids classes for aspiring ninjas as young as 4 and up to 12 years old.

Showtime Gymnastics offers classes for kids ages 18 months to 18 years, competition teams, half- and full-day weekly summer camp, field trips and birthday parties.

With ninja warrior-style obstacles, the gym is designed for kids ages 4 to 15 and offers afterschool programs, camps, birthday parties and other gatherings.

Saginaw County's Showtime Gymnastics offers gymnastics classes, "ninja" classes and summer camps for kids.