Exercise can help battle stress, but many consumers are rethinking their gym memberships in hopes of trimming costs.

    That in part is helping to fuel a growing niche in the health club industry - self-service gyms that never close. While typically smaller than their full-service competitors, these gyms offer fewer amenities, cheaper prices and 24-hour access, though it could mean a member is working out alone.

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    What is your average annual income for your fitness-related work/business?