depends on what you want to achieve:

personally, my stamina is best working out at 7am without food in my belly. standard zone 5 cross fit workout for 1h.

personal bests are impossible without some carbs because your body is using up your residual blood sugar in no time.

creatin timing is completed irrelevant as long as your tissue is saturated >20 days of >5g daily.

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ah and protein for muscle growth is best within one hour of training.

this is all backed by peer reviewed studies. just punch it into a deep research.

Thanks for your input Alexander