Sentence 1: Cathy was trying to get back into exercise. 
 Sentence 3: Cathy decided she would try out one spin class 
 Sentence 4:  After trying the class, Cathy loved the excitement of the class 
 Sentence 5:  Cathy then signed up for a 12 week spin class at her gym 
 Option 1: Cathy saw a flyer at her gym for spin classes. 
 Option 2: She hated riding bikes so she decided to do weight lifting.