Sentence 1: Nick came down with a very serious illness one day. 
 Sentence 3: Nick was afraid he would have to spend his life bed ridden 
 Sentence 4:  After a few hard months, Nick's health started to improve 
 Sentence 5:  Nick was so happy to be healthy, he started running every day 
 Given Sentence 2: His doctors told him that he may not be able to exercise again.