The first thing is improper technique, and this includes footwork (sabaaki), distance (maai), and rythym (ritsudo).
The second thing is your opponent (while training) knows what you are going to do! It is easy for him to stop a technique from working. In reality will your opponent know what you are going to do in a fight, I don't think so!
Third, when we train it is like stop action, where you can see all the holes and weaknesses of any technique. Now this becomes very difficult when I attack you and apply techniques for real. I don't tell you what's going to happen, I strike and tear at kyushu (weak points of the body), I use all my skill to prevent you from hurting me and I will cause you pain.
I made this to encourage people to start Martial Arts training, it is very rewarding as you go forward and learn much fascinating things.
My advice to the beginners is, be acquiescent
