Definition: In this task, you're given a four sentences of story written in natural language. Your job is to complete end part of the story by predicting appropriate last sentence which is coherent with the given sentences.
Input: Sentence1: John was a serious athlete. Sentence2: He decided to enhance his training methods. Sentence3: He decided to only wear minimalist footwear. Sentence4: He noticed his lower leg strength improve.

He attributed this to his new footwear.