Sentence 1: Mark had a bad day at work. 
 Sentence 3: Mark was not used to exercising and it was hard for him 
 Sentence 4:  However, he felt really good afterwards 
 Sentence 5:  Mark decided he was going to start exercising more often 
 Option 1: He came home and decided to go for a jog. 
 Option 2: He came home and went for his evening run.