I had the pleasure of training with my 250 pound student who was a college wrestler. When we faced off, he would drop down quickly and get my lead leg fairly easily. However on his 3rd attempt, I moved out of range immediately and then popped him with a committed jab. He immediately stopped and said that this would disrupt his ability to get set to take me to the ground. So as long as I was a moving target, it would be difficult. Ving Tsun is not some stiff martial art that relies only on a limited set of strikes. It can be deployed to whatever situation needed, which includes using a lot of mobility. Even though I used a jab, the jab is just a technique.