Q: I workout for an hour four times per week. Do you think it is better to work the entire body all four days, or split it and devote the whole hour to intense upper body training one day and then intense lower body the next? To me it would seem better to work the entire body, but then I suppose you wouldn't work each muscle group as intensely as if you were to split it up. Or maybe I'm just overthinking it...

A: Both whole-body and split approaches are perfectly fine, but if you're working out 4 times/week, then doing whole-body may not give quite enough recovery time in between sessions. Whole-body routines are typically done 1-3 times/week. So in your case a split routine might be more appropriate. You can do upper body twice and lower body twice, for example. Or you can follow something like this routine.