USA Ninja Challenge is planning to open soon at 5850 Kroger Drive, Ste. 140, in Keller, according to owner Marcus Heyn. The training studio will host an open house from 3-6 p.m. Jan 29, according to the Facebook event. Heyn said classes will begin Feb. 8. USA Ninja Challenge is a year-round obstacle course training program that is a combination of basic skills from gymnastics, climbing, cross training, and track and field for kids ages 4 to 17, according to the studio’s website. USA Ninja also offers a class program with six levels, parties and camps. 682-593-2795. www.ninjakeller.com