Question

find the incorrect pronoun and type it correctly. it is recommended that marathon runners start training early so that you are fully prepared to cover twenty - six miles within the six - hour time limit imposed by most races.

Explanation:

The subject is "marathon runners" (third - person plural), but "you" (second - person) is used. It should be "they" to maintain pronoun - antecedent agreement.

Answer:

Change "you" to "they".