Lawrence has made some great points. I don’t own a gym, but if I did, I would develop a safety policy covering the gym and my business in general. I would speak with an attorney first. From there, I would follow his/her suggestions as to where to post the rules and guidelines as well as include them in the membership contract. I believe when a member sings up for a membership, that is the best time to explain he rules and guidelines that must be followed. I would also include safety rules and regulations into your SOPs (Standard Operating Procedures) so they apply to employees as well. Include them in your employee manual and have employees sign a document acknowledging receipt of the manual and its contents and agreeing to abide by them. Be sure you post them in an employee break room or wherever your other employee-only postings are.