Balance
Balancing is also crucial to the running process. Some may think "Well I'll just rotate my chest back and forth and I'll be fine." Not usually the case, my friend. When twisting repetively you will usually fall (4). Pay attention to your ghost! Always try the rotation, but don't do it unless you need to keep up, it can hurt your balance. Excessive use of the lumbar can't hurt as much; It can help or ruin your balance.