Gym question: better to workout everything each time or work muscle groups?

Mens Health Top Workouts
mens health top workouts question by %DeeDee%: Gym question: better to workout everything each time or work muscle groups?
I keep hearing people at the gym saying stuff like "this is my arms day", "this is my abs and back day" or "this is my legs day", but I personally like to work all my muscles top to bottom during each workout. I find when I tried to have "days" of working out one particular muscle group each time I got to the gym, I never feel satisfied because I

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