I have a problem with one aspect of this photo. I was setup in a good position with the track circling through the frame, fans in the background, the best lighting I could get at this time and, with a little cropping, the framing I wanted. And my runner was leading. But, the missing lower leg bothers me.
I was shooting in burst mode. And unfortunately, this particular frame was captured with the front runner's knee fully bent so that the lower leg is not visible.
In this situation, fast frame rate cameras rule. Faster frame rate-capable cameras have a reduced likelihood of a missing lower leg in the ideally-timed shot. Worst case is when the camera's frame rate synchronizes with the runner's pace so that most shots are missing a lower leg.