Do it even when you don't feel like it. You need endurance to get through life... When you say you're going to do something and don't do it, you'll feel like you can't trust yourself. How about being able to trust the man in the mirror?
LL Cool JIf you do cardio one day and the next day you can do weights, do it that way. If you need to do it at night or in the morning, do it that way. Whatever you need to get it done, just get it done.
LL Cool J