Eric Casaburi - From Serotonin Centers to 108,000 Gyms: Solving Longevity's Distribution Problem

Sponsor: Perfect Gym – The Gym Management System Built for Multi-Club Ops

Perfect Gym, a European fitness software leader, enters the U.S. market with a focus on seamless, risk-free migrations for multi-location gyms. The platform connects with 120+ integrations, allowing operators to use their preferred tools without being locked in. A major client with 250+ locations across six countries was migrated in just 20 days with zero member loss.

From Serotonin Centers to SLIM: The Evolution of Longevity Distribution

Casaburi traces his journey from founding Retro Fitness to launching Serotonin, a longevity brand born from observing that the most loyal gym clients were also the most compliant with medical protocols. This insight led to the creation of SLIM—a scalable, low-risk model to embed longevity services inside gyms.

Why Gyms Are the Missing Link in Longevity: The Retention Crisis

Casaburi reveals that 60% of gym members quit within a year, with most leaving by mid-April. He argues that the real problem isn’t marketing—it’s retention. The solution? Deliver visible results early. If a member sees a change in their body or energy within 3–4 weeks, they’re far more likely to stay.

The SLIM Model: How Serotonin Works Inside Gyms

SLIM is a 2–500 sq ft wellness center inside gyms, using dead space. It offers lab testing, in-body scans, hormone therapy, IVs, and peptides—managed entirely by Serotonin. The gym doesn’t handle medical compliance, and members get a full health suite at no extra cost to the gym.

The Real Problem with Online Longevity: No Oversight, No Results

Casaburi warns against online-only longevity platforms, calling them the 'wild, wild west.' Without in-person monitoring, clients risk dangerous side effects—like high hematocrit from improper testosterone dosing—and lose muscle mass on GLP-1s due to lack of protein and recovery support.