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 .

Generate a question about the above context.
Why is the person attempting to make up for not exercising on the day prior ?
Options are:
(1). None of the above choices .;
(2). They are fulfilling a requirement for an online gym class and must exercise a given number of hours;
(3). They are required to walk to work as they can not afford to take a taxi and they missed the day before;
(4). They want to get into better shape and must get a certain amount of exercise to do this;