text: I get a mix of all three times with the way my schedule is.  I would have to say I enjoy running at night because it seems like the times passes much quicker and my sides never hurt from running.  But I know the morning is the best time to go for weight loss.  I do love the way it feels AFTER a morning workout( which I do on Sundays) and then I have the whole rest of the day to go with my heart feeling great!