<qa>  What is a comorbid medical disease that would prevent safe participation in an individual exercise- Any comorbid medical disease that would prevent safe participation in an individualized exercise program such as severe osteo-, rheumatoid-, and gout-related arthritis, unstable angina, exercise-induced arrhythmias, uncontrollable diabetes, or atrial fibrillation with rapid ventricular rate in the preceding 30 days. 