Senior Alexus Wiltz，18，said the workout had improved her performance on the basketball court．“I noticed I was faster．I paid more attention on the court，my defending was better,”she said after a recent class．“It just really helped me．”

　　But some doctors and researchers advise caution，saying the exercises that involve lifting weights can lead to injuries，particularly when performed by few inexperienced people．

　　Doctor Craig Finlayson at Lurie Children’s Hospital of Chicago said he was worried that while strength training is fine for kids，heavy weights could be trouble for teenagers who might hurt themselves by trying to do too much or using poor form．

　　CrossFit Inc．，the company that certifies trainers and licenses gyms，disagrees that its program is more dangerous than other fitness routines．Gym teachers in Waukegan’s Greg Moisio，whose two-campus school has about 73％kids taking CrossFit each day，also say the risk of injury can be reduced with proper teaching and CrossFit’s flexibility．

　　28．Why have schools around the Chicago area adopted CrossFit?

　　A．To improve students’performance in competitive sports．

　　B．To introduce something more challenging to the students．

　　C．To make traditional gym classes more attractive．

　　D．To help solve the students’weight problem．

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