Size and gender are not decisive factors in Taijiquan

An excellent way to prevent a Boxer or any opponent striking you while you attack him is to lock his both arms. An effective pattern to use is "Cross-Road Hook Hand". Indeed, many people caught in such a situation will be quite helpless against your strikes. Some fine points on how to apply this technique were explained in this course. It is also interesting to note that size and gender are not decisive factors in kungfu as you can see an elegant lady sparring against a giant in this video series.