Definition: In this task, you're given five sentences, numbered 1 through 5, and two options a and b for possible titles for the story. Your job is to choose the title that better fits the story. Indicate your choice by 'a' or 'b'.
Input: Sentence 1: Tom was a powerful boxer. Sentence 2: Unfortunately his cardio wasn't too good. Sentence 3: He tried to train in higher elevations. Sentence 4: It improved his cardio a bit. Sentence 5: Not enough to make him good, though. Choices: a. Washing Machine. b. Bad Cardio.

b