can anyone share any tips for long warehouse shifts?

I recently managed to get a job in a factory with an immediate start so i had no time to prepare myself for the physical aspects of the job. I'm picking orders all day, i did a half shift friday to prepare for monday and it was really, really hard, i woke up this morning feeling like i had been hit by a truck, my legs are so shaky i'm lucky i didnt have to go in today but from monday I'll be doing it everyday, is there anything i can do to at home to prevent waking up with jelly legs and muscle aches? I took a hot bath but it didnt really help. Thanks.

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