Sensei Ashley Czworniak of Chicago leads the intermediate Kid's Karate Club in jumping jacks at the start of class at the Norridge Park District. | Ryan Pagelow~Sun-Times Media

As a junior leader Linnea Holtz, 7, of Elmwood Park judges younger kids sparring during Kid's Karate Club at the Norridge Park District. | Ryan Pagelow~Sun-Times Media

Raymond Chen, 7, of Harwood Heights spars with a partner during an intermediate class of Kid's Karate Club at Norridge Park District. | Ryan Pagelow~Sun-Times Media

Linnea Holtz, 7, of Elmwood Park spars against an opponent during the advanced class of Kid's Karate Club at the Norridge Park District. | Ryan Pagelow~Sun-Times Media

Randy Ryan, 9, of Chicago judges younger sparing opponents as a junior leader in Kid's Karate Club at Norridge Park District. | Ryan Pagelow~Sun-Times Media

Adam Brenner, 9, of Norridge spars with a partner while his dad Tim, a parent helper, judges during an intermediate class of Kid's Karate Club at Norridge Park District. | Ryan Pagelow~Sun-Times Media

Noel Ronan (right), 8, of Chicago spars with Michael LaRusso, 8, of Norridge during an advanced class of Kid's Karate Club at Norridge Park District. | Ryan Pagelow~Sun-Times Media

Randy Ryan, 9, of Chicago jump kicks an opponent while sparring during an advanced class of Kid's Karate Club at Norridge Park District. | Ryan Pagelow~Sun-Times Media

Sensei Ashley Czworniak of Chicago ties a yellow belt for Max Wilczynski, 6, during an intermediate class of Kid's Karate Club at Norridge Park District. | Ryan Pagelow~Sun-Times Media

Noel Valentin (right), 9, of Harwood Heights spars against Adam Brenner, 9, of Norridge while Brenner's dad Tim, a parent helper, judges during an intermediate class of Kid's Karate Club at Norridge Park District. | Ryan Pagelow~Sun-Times Media

Norah Dignan (right), 8, of Chicago spars against her twin Erin during an intermediate class of Kid's Karate Club at Norridge Park District. | Ryan Pagelow~Sun-Times Media

Jimmy LaVecchia (left), 8, of Chicago, Michael Mikolagczyk (center), 8, of Norridge and Patrick Mojsa, 8, of Norridge watch other karate students spar during an intermediate class of Kid's Karate Club at Norridge Park District. | Ryan Pagelow~Sun-Times Media

Vincent Demeo (center), 7, of Norridge stretched before an advanced class of Kid's Karate Club with Noel Ronan (right), 8, of Chicago and Randy Ryan, 9, of Chicago at Norridge Park District. | Ryan Pagelow~Sun-Times Media

Noel Ronan (left), 8, of Chicago spars against Linnea Holtz, 7, of Elmwood Park while sensei Ashley Czworniak of Chicago judges during the advanced class of Kid's Karate Club at the Norridge Park District. | Ryan Pagelow~Sun-Times Media