benefits to all supposedly
personally I can't do anything until I've had breakfast, I've tried running beforehand and I just feel like death... but straight after breakfast sets you up nicely for the day, puts you in a good mood, gets you woken up and energised... in the afternoon/evening you will be more warmed up and that's when I personally work out best, and later at night is nice because there's less people around so you can get some solitude