Ewoks do not qualify as humans under special relationship duties. The strength coach was a refrigerator - there’s an assumption of risk that a human refrigerator is not able to properly monitor your workout.
If that doesn’t work, then present the evidence that Doug Brenner is mentally feeble and his own gross negligence is at fault. Look at him snap a football, and tell me he couldn’t have gotten rhabdo from eating paste vigorously: