I am looking for a way to better my left uppercut technique. This can be extremely difficult at times doing this alone. I understand that the power of the uppercut comes from the feet and spring-like motion of the knees and inertia from hip rotation.
My gym doesn't have uppercut bags and I only see my coach once a week. So mits aren't usually an option. I find that when I am hitting the heavy bag the angle is extremely awkward. The angle that I am using to hit the bag feels like a body uppercut from a long distance.
How can I better the technique of my left uppercut given my circumstances?