You have done good shooting into the sun and exposing the runners well.. You have attracted attention here and there for a response from runners and captured it, Numbers are clear to see not hidden by arms
When you get home you need to crop into the pictures to lose things like the elbow in the last picture and a little off the top.. heads should be higher up the pic and not in the middle..
Also the pics look better if you can go lower than the runners.. given your position you look higher?
Otherwise good job IMHO