I can't predict whether you will be sued, but your chances of winning any suit (leaving aside the issue of your employer's prior breach for now) may depend on the jurisdiction whose law applies. If California law applies you will almost certainly win a lawsuit based on a claimed breach of the "no poaching" clause. California prohibits these types of employment agreements (called "restrictive covenants") except under rare circumstances, such as to protect the employer's trade secrets. Unless the names of your clients are your employer's trade secrets (which would depend on factors such as whether they were your employer's customers before you were hired and, if so, the time and expense your employer incurred in obtaining these customers, how difficult it is to learn the relevant information about them, what steps your employer takes to keep this information secret from competitors, etc.), it cannot, under California law, prevent you from "poaching" them. Look up California Business and Professions Code Section 16600, 16601, and 16602. The laws of other states are more receptive to restrictive covenants, but you would still have a good chance to prevail in the suit. Most states enforce restrictive covenants to the extent that they are reasonably necessary to protect the employer's legitimate business interests. For various reasons (including the number of pilates studios already competing, the unlikelihood that the names or other information about potential pilates students is very difficult to obtain or could be considered a trade secret, the lack of special skills necessary to be a pilates instructor; I couldn't do it, but the skills aren't as difficult to find as say a surgeon or an opera singer), I think it unlikely that your employer would be able to enforce the no poaching covenant against you. Some other factors which could affect this analyis are how long the covenant is supposed to last, whether it prohibits you from accepting your former students if they contact you or only prohibits you from soliciting them, and whether you received any other consideration, beyond just getting the job, for signing the covenant.
Even if the covenant is deemed enforceable, you should not be bound by it if your employer had, before you began "poaching", breached a material provision of your employment contract. In other words, if your employer didn't pay you for two weeks, that would probably be material; if your employer gave you a slightly smaller locker than it had promised, that probably wouldn't be.
One last thing. While you work for your employer, you owe your employer loyalty. You can't start "poaching" clients while you still work for your employer. You may be able to inform them that you are leaving to work for another studio, but it's a bit of a gray area, so to be safe, you would be better off if you didn't start soliciting your current clients until after you leave your current job....
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