Nervous about a job I start Monday.

I have accepted a very physical factory job I start Monday. It’s a 12 hour job and hot. I’m extremely overweight and not in good shape I’m 6’5 460lbs. Over the past two weeks I have been walking a mile and running 10 40 yard “sprints” every other day. I’ve only lost a few pounds but it gets easier each time. Is this the right way to prepare myself for the job? What else should I do before Monday? Or should I just suck it up and make myself do it?

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