CAPACITY (Cardiac Amyloidosis and Physical ACtivITY) Study

Who May Qualify: - Age \> 18 - New York Heart Association (NYHA) Class I-III Heart Failure - Able to Exercise - On stable treatment for their cardiac amyloidosis or under active surveillance - expected to live at least 6 months - Ability to understand and the willingness to sign a written willing to sign a consent form document in English, and the willingness/ability to comply with the protocol activities - Participant must be able and willing to follow the cardiac rehabilitation activities Who Should NOT Join This Trial: - Inability to provide willing to sign a consent form - Inability to commit to in-person supervised exercise sessions for three one-hour sessions a week for 12 weeks - NYHA Class IV Heart Failure - Pulmonary disease requiring home oxygen - Gait instability or history of prior falls - In the opinion of the Principal Investigator, have a clinically significant comorbid disease that is likely to affect the ability of the patient to complete the trial, interfere with their ability with measurement of self-reported outcomes. Always talk to your doctor about whether this trial is right for you.