Thanks for replies My point is that if you are big and strong then you are more likely to "last the course" i.e. train for a long time and reach high rank, high ability and seniority in the shotokan/goju/judo/kyokushinkai world. Simply because you don't get bounced around so much. Trading semi contact body blows and hard blocking with someone who out weighs you by 100LBs is not easy. It does make you think that perhaps aikido or wing chun might be a better idea ? Of course, the lighter guy has an advantage with stamina and being light on their feet, but in the "old school" world of straight line shotokan, its not easy to make that count.