Seeing how it's now acceptable for pro runners to drop out of marathons because of , "it's cold my face hurts,boo hoo", "It's windy I'm not on PR pace, wah wah", "It's raining, I'm wet, boo hoo wah!, I'm tightening up", shouldn't sprinters have the option also? If it's cold and windy for a sprint race split times for 50m should be called out over a loudspeaker. If it's not on their PR pace they can then drop out claiming they weren't going to run a good time anyway and why waste the effort.