That's a pretty clear threat as well as a violation of the Elite TOS.
"You agree, through your use of this service, that you will not use this Forum to post any material which is knowingly false and/or defamatory, inaccurate, abusive, vulgar, hateful, harassing, obscene, profane, sexually oriented, threatening, invasive of a person's privacy, or otherwise violative of any law. You agree not to post any copyrighted material unless the copyright is owned by you or by Elite Fitness."
Wonder what your new username will be if you keep it up?