Rebel yell was so rough and jackhammering when I rode it last Thursday.   I got tiny pops ejector airtime from the warpy track and the ton of jackhammering.  Now my back has been hurting on and off since I went there.   I am 22 years old so it seems like it should not affect my back very much.  I wish they would topper track rebel yell so that it would be much smoother.   The turn out of the station and the rest of the prelift was so warpy I could see the trains swaying and wiggling as we went to the lift.