Sentence 1: Martha was in the middle of an extremely long hike. 
 Sentence 3: At this point she was so far in that turning back was useless 
 Sentence 4:  She forced herself to trudge through her laziness 
 Sentence 5:  When she did finish the hike, she felt thrilled and proud of herself 
 Option 1: She was full of energy and was hiking along at a quick pace. 
 Option 2: She was super tired and getting ready to give up.