Gym?

Hey just recently got hired. Start in January just something to do while I got to college. Studying to become a navy nurse. Just wondering if the job is exhausting like overnight stocking and if you guys go to the gym before your shift

Edit: position is merchandiser I drive my own car to each store and it's 40 hours 4 day work week 3 specific days off. full time employee. My shift is 12pm to 10pm. Thinking 5 or 6am for an hour or two.