In demand jobs that don't involve sitting at a desk all day

I'm seeking a career change, and after having a job that involved sitting at a desk all day, that is something I don't want to again. I'm considering a police academy, but I'm not 100% sure on that. What are some good jobs that are in demand that don't involve sitting in front of a computer all day? I have both a bachelor's and masters degree, so I'd prefer not to have to go back to school if possible! I need variety in my work!

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