If you're a struggling student, you'll find that you'll have access to a lot of discounts, and some of those will include exercise spots. The discounts for students can make a huge difference so make sure you check out what deals are available to you.
However, if you're not in school, check to see if your office building has a gym. You might be eligible for some deals. My friend managed to get free access to a gym that's located at her workplace just by asking.