Sentence 1: Christian has been overweight all of his life. 
 Sentence 3: Christian went on a diet and added exercise to his daily routine 
 Sentence 4:  Six months later, he's lost nearly 100 lbs 
 Sentence 5:  Christian's never been in better shape before 
 Given Sentence 2: When he couldn't fit into an airplane seat, he decided to get fit.