Sentence 1: Rick's friends asked him to go bowling. 
 Sentence 3: He decided to go anyway and had a lot of fun 
 Sentence 4:  But he noticed a slight pain in his back 
 Sentence 5:  And after he picked up another bowling ball, it became worse 
 Option 1: He was excited because he felt very strong. 
 Option 2: But he was reluctant because he was so weak.