I would admit that maintaining a super lean body year around takes dedication. For me to be a naturally heavier guy, i really have to watch my body fat levels. Now that I've transformed my life to live leaner things at time are definitely a little more challenging. But over the past 3 years i've learned so much about my own body.
I don't know if that is part of the question, but holding a really low bf% (6-8%) all year around isn't impossible my mind but it does take a lot of dedication and preparation.