Design
Gym Membership & Class Booking System
Design a gym management system handling memberships, class schedules, and capacity-limited class bookings.
This is a Low-Level Design (LLD) problem. New to LLD vs HLD? Start here.
01 - Why interviewers ask this
Capacity-limited class bookings are a compact, realistic test of atomic reserve-or-waitlist logic — a pattern that recurs across many booking-style interview questions.
02 - Where this system exists in the real world
You interact with this design every day.
ClassPass / Mindbody fitness booking platforms
Gym and studio class scheduling systems
Corporate wellness program booking tools
03 - What you'll master
Solve this once. Know it forever.
Enforce class capacity atomically
Implement waitlist promotion on cancellation
Model membership tiers and check-in flows
04 - What you'll design
6 functional · 2 non-functional requirements.
Manage membership plans (monthly, annual, day-pass)
5 more requirements inside
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05 - Companies that ask this
You may face this exact question in your next interview.
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