I have been experimenting with ketogenic dieting, I have gone to the gym in the AM after eating only a few servings of coconut oil, 4 (or5) servings X 120 calories, it may sound crazy and maybe technically it is not fasting, but it is hell, but effective.
I have gotten into stuff these guys write
https://greenfieldfitnesssystems.com/ and its a whole new way of looking at things. When it comes to fat loss I have found that people who used to carb cycle weren't going far enough it would seem, I have been ketogenic for a few months, its not a situation about gaining muscle er se, though there is a book on low carb performance, but the ketogenic state is supposed to be muscle sparing, and the energy, the reduced recovery, the mental clarity, its pretty amazing. So I thought sharing this might be relevant to the original question.
This week I was running some T3 and clen and couldn't understand why blood sugar was so high, I didn't know that T3 can actually raise blood sugar, so I had to cut it out, but with a little test. and this diet approach, I have been learning a lot. I am saving the T3 and clen for a later time for now and want to incorporate some peptide(s).
So, I would go no carb morning cardio at least, and fasting seems to work for people too, gotta find by trial and error, my $0.02