Sentence 1: Rob ran cross country in college. 
 Sentence 3: One day the decided to try doing a triathlon 
 Sentence 4:  They enjoyed it so much that they did several more 
 Sentence 5:  In their third race, Rob won the state championship for his age group 
 Option 1: After college, he had extensive knee surgery and is unable to run anymore. 
 Option 2: After graduation he ran with his friends from work.