Planet Fitness, Inc. (PLNT)

Planet Fitness is the largest fitness-club franchise operator in the US by number of locations, running over 2,400 gyms primarily under the Planet Fitness banner. The company pioneered a low-cost, high-volume membership model that trades ambition (no personal trainers, limited equipment focus, modest facilities) for accessibility (memberships starting at $15–20 per month). Publicly traded on the NASDAQ (PLNT), it has built an enormous installed base of paying members, most of whom visit infrequently or not at all—a business model that works if churn is predictable and new member acquisition is cheap.

The business model: why members never work out

Planet Fitness is not optimized for the serious gym-goer. That person wants specialized equipment, lots of free weights, protein shakes, and a culture of hard training. Planet Fitness stripped all of this away and offered instead a friendly, non-intimidating space with pizza nights, unlimited fitness classes, and enough treadmills and machines for casual use. The genius was understanding that the actual market for gym memberships is not people who use them intensely, but people who want to believe they will and are willing to pay a small recurring fee for that possibility. The company calls this the “let me get fit someday” market segment, and it is vastly larger than the “serious lifter” segment.

This creates a mathematical virtue for the operator: a huge base of paying members, most of whom show up rarely or never, generating predictable recurring revenue that can be spread across real estate costs and equipment depreciation. If the average member pays $20 per month and actually works out 2.5 times per month, the per-visit cost is $8. If a member pays but visits zero times, the per-visit cost is infinite, and the margin is therefore infinite—that member is pure profit.

The flywheel is strong. More locations mean more accessible gyms, which drives more signups. More signups mean the fixed costs of real estate and equipment are spread across a larger base, reducing the breakeven point. And the monthly billing is sticky; most people forget they are enrolled and leave the membership on. Churn exists, but it is often measured in years, and a member who shows up once per month is infinitely profitable compared to one who never comes.

Revenue streams and the franchisee relationship

The company operates in two modes: corporate-owned locations (which generate direct membership and ancillary revenue) and franchised locations (which generate royalty fees and equipment sales). The corporate locations are more profitable on a per-location basis because the company captures all the membership revenue. The franchised locations are profitable on a portfolio basis because they scale the brand across the country with minimal capital expenditure—the franchisee owns the lease and builds the facility, and Planet Fitness takes a royalty (usually around 7–8% of member revenue) plus sales of equipment and supplies.

This hybrid model has been the key to rapid expansion. By franchising, Planet Fitness avoids being a real-estate company (which is capital-intensive and operationally complex) and instead becomes a brand and licensing company. Franchisees bear the location risk; Planet Fitness bears the membership and acquisition risk. As long as membership revenue is growing and churn remains manageable, the system works.

The achilles heel: acquisition and churn

For this model to sustain growth, the company must continuously acquire new members at a cost lower than their lifetime value. Once you have saturated a geographic area with gyms, growth slows unless you raise prices, spend more on acquisition, or both. The company has pursued aggressive expansion—adding hundreds of locations in recent years—which drives absolute membership growth but also brings saturation risk. And the pandemic revealed a vulnerability: when people cannot visit the gym, they can and do cancel. Even a brief disruption broke the “people forget they are enrolled” spell.

Churn is the shadow metric on which the whole model depends. If churn rises to 5% per month (a 60% annual churn rate), the member base becomes unstable and requires ever-higher acquisition spending to grow. If churn drops below 3% per month, the business compounds beautifully. The company closely guards churn data, which suggests it sees this as competitive.

Unit economics and profitability

A typical Planet Fitness location breaks even after roughly 2,000 members (depending on real-estate costs, which vary wildly by market). Successful locations in dense urban areas can reach 5,000–8,000 members, which drops the per-member cost of real estate and equipment dramatically, driving high margins. Struggling locations in low-density areas might never break even and become losses. This creates an incentive for franchisees to cut costs aggressively (reducing facility quality, understaffing) rather than invest in member experience, a tension that can hurt the brand.

The corporate locations, by contrast, are flagships—well-maintained, fully staffed, in high-traffic areas. They serve as brand ambassadors and generate data on what works. But their profitability has limits: even with 10,000 members at $20 per month, the gross revenue is only $2.4 million per location per year, from which the company must pay rent, utilities, staff, and equipment maintenance. Location profitability depends entirely on the real-estate deal.

The saturation question

The US has thousands of small towns with no gym; these remain expansion opportunities. But the major metropolitan areas are likely approaching saturation. If you can already choose between three Planet Fitness locations within five miles, the marginal location does not add growth—it cannibalizes existing members. This means that for the stock to deliver growth, the company must either pursue price increases (raising the monthly charge, which risks churn), improve member engagement (e.g., through apps and digital services), or expand internationally. The company has begun international expansion but faces cultural differences in fitness spending and competitive advantages from regional operators.

Investment perspective

Planet Fitness is best understood as a predictable cash-generation machine so long as the core assumptions hold: that member acquisition remains cheap, churn stays manageable, and the brand maintains its appeal as the accessible gym for non-serious exercisers. The business is defensive in recessions (gym memberships are cheap and people hesitate to cancel) and cyclical in the upside (more memberships when consumers feel financially secure). The stock price has historically reflected these qualities, trading at multiples influenced by membership growth and observed churn rates.

Investors should track membership growth by location cohort—which vintage of locations is showing the strongest retention?—and the health of new-member acquisition costs relative to lifetime value. Any negative surprise in churn or a rapid rise in acquisition costs would signal that the model is beginning to strain. Conversely, demonstrated success in international expansion or significant digital-service monetization would suggest new paths to growth beyond organic US expansion.