American gyms routinely enroll far more members than could physically use the facility at once. That is deliberate, and the pricing structure follows directly from it.
Capacity assumes low attendance
A club sizes its equipment and floor space against expected simultaneous use rather than total membership, much as an airline sells against expected boarding.
Because typical attendance is a fraction of enrollment, a facility can support a membership base many times larger than its physical capacity.
January reveals the assumption, when attendance briefly approaches what the membership implies and the floor becomes unusable for several weeks.
Low monthly prices depend on infrequent use
Heavily discounted memberships are viable only if the average member costs the club little, and cost is driven by attendance rather than by enrollment.
A member who attends rarely subsidizes one who attends daily, and the pricing model is built around that cross-subsidy being large.
This is why budget clubs often lack the amenities that attract frequent attenders, since the format is optimized for members who intend to attend rather than members who do.
Contract design reduces cancellation
Automatic renewal, notice periods, and cancellation processes requiring a letter or an in-person visit all raise the effort required to stop paying.
Small recurring charges also fall below the threshold at which people review their spending, so a forgotten membership can persist for a long time.
Several states now regulate cancellation procedures for these contracts, and requirements vary considerably by jurisdiction and change over time.
Onboarding is the real product
Clubs know that members who establish a pattern in the first weeks are more likely to remain both attending and paying beyond the first year.
Introductory sessions, orientation appointments and early check-in incentives are aimed at that window because behavior established there tends to persist.
The same reasoning explains class-based formats, where a scheduled appointment with other people supplies the commitment that an open floor does not.
What this means for choosing a facility
Price per month is a poor guide, since a cheap membership used twice costs more per visit than an expensive one used regularly.
Distance and schedule fit predict attendance better than equipment quality, because the main determinant of showing up is how little has to be rearranged to do it.
Anyone starting exercise with a cardiac condition, joint problems or a recent injury should have the plan reviewed by a physician or physical therapist first.