I'm plenty happy with the results of my half-assed half-marathon training.

But I know a full marathon is a different animal.

I really hate to get obsessed with following a rigid training plan and needing to do X workout on Y day. I'd much rather do what I've been doing - more or less interval day, tempo day, long run day; strong emphasis on the "more or less," and building miles as feels comfortable with an eye on the calendar.

What do you say? Does full marathon training need to be full-assed? Or can I get away with it?