If you have a good left hook it usually doesn't matter how big you are. The average person only tries to punch with their right hand, and they never look for a left hand incoming. I learned this at a very young age being left handed, just stand like a righty and break their nose with a left hook.I had a friend in college who was about 5'5" tall....and a golden gloves out of Harrisburg, PA. You didn't want him on your bad side.