What are you trying to accomplish? What is your goal? Sounds like you do a lot of stuff, but what what is your overall fitness goal?
If you've got back problems, you need to get it diagnosed. Don't press it. I'm 49 and have lost about 50+ pounds the past year, basically by running, but the same premise is there, if you're hurting, you need to back off.
We are told by our government NOT to judge Muslims by the actions of a few crazies. We are also told by this same government TO judge ALL gun owners by the actions of a few crazies.