<qa>  What is the primary purpose of the present proposed study?Few studies have been able to demonstrate intervention efficacy for improving daily activity in heart failure HF. Exercise alone is ineffective, though psychosocial-based interventions including health coaching and daily activity feedback appear to be promising. Therefore, the primary purpose of the present proposed study is to investigate the effect of two different intervention approaches 1. daily activity feedback with associated encouragement, and 2. health coaching with an associated individualized home exercise program on daily activity, exercise tolerance, HF-related health status, and lower extremity functional strength. A secondary purpose is to compare daily activity as recorded by Medtronic implanted cardioverter defibrillator ICDs and cardiac resynchronization therapy CRT devices to daily activity recorded by a well-established triaxial accelerometer. 