Generally you use the word well to describe an activity that happened, while you use good to describe a thing. In the sentence above, sprinting is an action word or a verb, that is why well is the appropriate word to fill the sentence. Well is often used to connote or describe adverbs while good is used to describe adjectives that describe the noun in the sentence. This is a general rule in sentence construction that is commonly misused. <span> </span></span>
