Based on the context and the answer, generate a question. 

Context: Yesterday I did n't walk or otherwise exercise . Today , I was hoping to make up for it by walking 6 km . I think I did about that distance , but it 's hard to tell from Google maps .

Answer:

They want to get into better shape and must get a certain amount of exercise to do this



Why is the person attempting to make up for not exercising on the day prior ?