2815: Mark Mastrov

What It Covers

Mark Mastrov, founder of 24 Hour Fitness, details his December 2024 repurchase of the brand he originally sold for $2.17 billion in 2005, outlines his turnaround strategy including remodeling 60 clubs, restoring personal training and nutrition programs, and explains why Gen Z, GLP-1 medications, and remote work are driving a fitness industry boom.

Key Questions Answered

• •Turnaround Playbook: When acquiring a distressed gym brand, buy the debt first rather than the equity. Mastrov purchased Crunch's $40M Goldman Sachs debt facility for $15M, giving him first-position control over the bankruptcy outcome. This strategy meant equity holders were wiped out while he controlled the reorganization, then rebuilt the brand from a position of financial strength rather than inherited liability.
• •Personal Training Revenue Gap: A single gym doing 3,500 workouts daily with only one personal trainer represents a massive missed revenue opportunity. Mastrov benchmarks 100+ personal training sessions monthly per 1,500–1,700 daily workouts as a baseline target. Gyms that deprioritized training staff post-pandemic should immediately audit trainer headcount against workout volume and begin aggressive hiring to close the gap.
• •GLP-1 Integration Strategy: Gyms that combine GLP-1 prescriptions, peptides, and NAD IV therapy with structured strength training and nutrition coaching represent the next major revenue category. Mastrov is building a "club of the future" in Las Vegas incorporating a full MediSpa with body scans and recovery services. Strength training is medically necessary alongside GLP-1 use to prevent muscle mass loss during fat reduction.
• •Leadership Identification Method: To identify high-potential leaders inside large organizations, cold-call employees mid-convention to present on stage without preparation. Mastrov used this technique to spot future Crunch CEO Jim Roly and others. Unscripted public performance reveals charisma, composure, and communication ability faster than any formal review process. Follow up by meeting their family and sharing meals to assess character beyond professional performance.
• •Equity Sharing as Retention: Giving operators meaningful equity stakes — not just high salaries — drives the loyalty that sustains multi-decade business relationships. Mastrov backed five former 24 Hour Fitness operators with equity in multiple Crunch franchise locations each; one, Curtis Harmon, scaled to 40 clubs. The model: fund talented people, set guardrails, let them grow their territory, and share the upside rather than retaining full ownership.
• •Gym Design Data Point: Internal analysis of 24 Hour Fitness locations revealed that clubs with mezzanine levels consistently ranked among the highest performers. The mechanism is social visibility — members on cardio equipment watch others train below, increasing engagement and dwell time. Mastrov subsequently mandated mezzanines or catwalks in new builds, with the San Ramon location holding the company's number-one revenue position for years after adding a full-length catwalk.