Exercises with Back Pain?

Just over a month ago I sat down and it felt like someone had stabbed my lower back.My Doctor says it's muscle damage and should go with time. It hurts if I'm walking too long, standing for too long, and any bending at all. It's advised to stay active with back injuries, and I still want to exercise (especially as I want to be able to support and motivate my wife as well).

So, I was wondering if any of you had any advice or exercises that I can do that won't put too much strain on my lower back?

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