Detailed Instructions: Given a premise, an initial context, an original ending, and a counterfactual context, the task is to generate a new story ending aligned with the counterfactual context and as close to the original ending as possible. Each instance consists of a five-sentence story. The premise is the first sentence of a story, and the second sentence, which is the initial context, provides more information about the story's context and the story's general plot. The original ending is the last three sentences of the story. Also, a counterfactual context is a slight modification to the initial context. You should write a new story ending that edits the original story ending as little as possible to regain coherence with the counterfactual context. To sum up, you should write the last three sentences of a story based on the premise(first sentence) and the counterfactual context(second sentence) of the story.
Q: Premise: Kelsi really needed to work out. 
 Initial Context: She had not worked out in ages. 
 Original Ending: She decided to go down to the treadmill. As she started running, she ran three miles. By the end of the last mile she was exhausted. 
 Counterfactual Context: She had gained a lot of weight since going off to college.
A:
She decided to go down to the treadmill. As she started running, she ran three miles. By the end of the last mile she was exhausted. 