If you see a still shot of a runner, you will notice that the body seems to tip over. What I always wanted to say. Here is one of my drawings. The hands are a bit strange. But you have to admit that this girl is definitely cool and sexy.
Nobody is perfect.
Practice is the only way to overcome your problems. I noted that the main point in the work is the finish, especially when you are inking. When finishing, you convert a sketch to a drawing. There your drawing gets expression. This definitely helped.