The first 90 days at a gym decide whether a new member stays for years or quits before summer. Members who hit three specific milestones in the first 90 days (a connection with a coach, a friendship with another member, and a visible early result) retain at 85 to 95 percent past the one-year mark. Members who miss any of the three retain at 30 to 50 percent. This is the onboarding playbook the highest-retention boutique gyms use, broken down by stage and built around their mi