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'.

Sentence 1: Roxy wanted a better looking backside. Sentence 2: So she decided that she needs to do some squats. Sentence 3: She started a 30 day squat challenge. Sentence 4: Roxy did 100 squats every day. Sentence 5: Now her backside is leaner, firmer and in a much better shape. Choices: a. Squats. b. Faulty fire alarm.
a