HIIT/sprint training will burn up calories like nothing else. I would absolutely recommend taking in some nutrients before doing this (morning or night). For your longer steady state sessions I personally would not run (if trying to build muscle) - I would do some steady state cardio that keeps your heart rate in fat burning zone (like a treadmill climb at a moderate pace). If that is the case - honestly I think you are fine doing it on an empty stomach. Because the intensity is low your not burning muscle. Either way, taking in some whey or BCAA in the morning isn't going to diminish your results -if that makes your workouts more effective - go with it. Everyone catabolizes differently depending on your current muscle mass/body fat. If you understand your body well you will know pretty quickly if you are responding to whatever it is you chose to do.So if I understood that, the main thing is getting cardio in, any time of the day, but if you take some whey and fat burner then longer but lighter cardio is good in the morning, before breakfast, like running for a long distance but after weights, in the evening HIIT or sprint training is a better idea. Doing both is even better? Is that right?
And if so, what about if you run on the days you dont lift, should I do some long distance in the morning and HIIT in the evening? Which is more important aswell cuz I dont always have time for two runs a day...