I have the same problem. I'm only 5'2" and noticed my first year here, that I was having horrible hip problems that got worse after a golf cart drive.
I still have hip problems but no longer have the pain after a ride in the cart. My solution: a $30 lumbar support pillow from Staples.
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Pretty sure you can get similar on Amazon for less, but Staples usually has those in the store if you want to check them out. They're on the end-cap in the far rear corner of the store, near the floor mats.