When training Kung fu as well as most other things in life that bring people together for that purpose egos get involved. This is not only natural but an essential part of the process. With that said, the ego needs to be kept in check for the best results. This is one meaning of investing in loss. A great example of this type of training is the willingness to try new techniques during sparring even though you don’t feel comfortable with that technique. You may end up in a bad position and get hit/thrown or submitted, but if you don’t make these type of attempts your skills and understanding will be slow to change. To accelerate your improvement, invest in loss.