Do you even lift?... Planet Fitness makes money from your ~$10/month gym membership, and from selling equipment to its franchisee-owned gyms — same idea as McDonald's franchise model, except PF sells purple ellipticals instead of McFlurry machines.
Shoo fly... PF's monthly fees are generally small enough to live with, even if you're not using the membership. Like a fruit fly, they're annoying... but bearable. The fruit fly membership strategy: keep it cheap, but make it hard to get rid of. Even when PF gyms were closed, cancellations had to be in person or by letter.
The 10-Q doesn't lie... That's the quarterly financial report public companies have to file with the SEC. While the fruit fly strategy may have helped pad third-quarter results, PF's overall sales still fell 37% — and equipment sales alone plunged 71%. Membership dropped from 15.5M people in March to 14M at the end of October. Even as gyms reopened, people probably got fed up with the brutal cancellation policy (fly = swatted).