After completing baseline questionnaires and receiving randomization, subjects in both groups will have a 20 minute initial in-hospital session ("week #1"), within a week of anticipated discharge, in which the interventionist will provide a treatment manual specific to their condition, review the rationale for the initial exercise, and assign the exercise. The next day, the exercise will be reviewed and an exercise assigned for the next week. Immediately after completing the exercise, subjects will rate (on a Likert scale of 1-5) ease of exercise completion, overall utility, and initial impact on hopelessness/optimism, to assess immediate effects.