hubby worked for a chiro while in massage school who had a nc clause. after he graduated and went into business for himself, he did let a few clients who had asked him to, know that he was working for himself. apparently ONE of them (because there were, seriously, only a handful) must've told the chiro they had heard from him, because he got one of those 'cease and desist' letters from a lawyer. well, we weren't 'actively pursuing' anyone anyway; there really wasn't anything to ;cease and desist'. he called the lawyer and explained the situation to her, she said she agreed that it was petty, and that if he'd just send a letter stating that he wouldn't contact any of "dr x's' patients who weren't already hubby's own clients by then anymore, that would suffice. we sent the letter and never heard anything more about it. a few weeks later, the chiro's receptionist called, a bit huffily, to let him know that there was a particular client who had INSISTED that they give her hubbys contact info- because she wasn't going to be going back to them for massage anyway so he wouldn't be 'stealing' her. the client did manage to find us, but she told us that the chiro was VERY resistant to giving the contact info out.
as for what the contract in question for the op says, how on earth are they going to enforce that? if s/he were to go into business for herself and put up a web page, for instance, how the heck is she going to know who is going to find it or not? i have heard of big corporations with 'trade secrets' making their people sign contracts stating that they won't go to work for the competition within x years of discontinuing emplyment at their company, but a massage client is a walking, breathing, thinking individual, not a trade secret. no contracts for mt's is stupid, in my opinion. you might as well try to get the clients to sign a contract stating they won't go get services from another mt.