You can expect larger, full-amenity gym chains to be open all night. They typically have more sophisticated security systems—cameras, sensors, keyfob doors—to protect and keep you safe. They may also staff their clubs at late nights, so a front desk attendant is nearby if you need anything.

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Not on this list are your local, smaller, "mom-and-pop" gym locations that close during evenings because of staffing shortages and low demand. If you need childcare during your workout, this is your go-to guide.