Most site selection tools model a single origin catchment — usually residential. For grocery
stores and pharmacies, that's adequate. For fitness studios, it's structurally incomplete.
A boutique cycling studio draws two distinct member cohorts from two different geographic
origins. Morning members and weekend members drive from home — their 15-minute residential
catchment defines the base. Evening members drive from work — their 15-minute workplace
catchment covers an entirely different polygon, often offset by 3–5 miles from the
residential zone. A fitness studio sited well captures both cohorts. One sited poorly
sits in neither catchment's sweet spot and relies on a single member type to fill classes
across all time slots.
The correct analysis maps both 15-minute polygons simultaneously and identifies the
overlap zone — the geographic area from which a member could reach the studio from
either origin within the threshold. Sites in the overlap zone have the highest structural
potential for all-day class capacity utilization.