Gym lead generation in 2026 is no longer about pumping ads into a Facebook campaign and hoping. The boutique gyms growing fastest right now run a five-stage funnel (attract, capture, nurture, convert, onboard), pull leads from three to five channels at once, and automate the follow-up so nothing falls through the cracks. This guide walks through each stage, the channels that work in 2026, and the math behind a healthy lead pipeline.