I formally relinquished my credential in 2009. Wrote them a letter informing them that I was unsatisfied with their academic rigor, their bullshit insurance program, and their embarrassing publications, that I was hereby relinquishing my credential, that I would no longer use it, and that they could not use my name as having the credential. Then I published it on the web and sent that to them too. If you can work at the club without the CSCS, just do it.