Assessing Physical Fitness in Cancer Patients With Cardiopulmonary Exercise Testing and Wearable Data Generation

Inclusion Criteria: * Patients with solid tumor or hematologic malignancies who are planning to receive a cycle of cytotoxic chemotherapy or patients who are planning to receive stem cell transplant. * Age ≥ 18 * At least 6 weeks out from surgical resection * Presence of working email address * Access to internet at home and access to electronic device(s) capable of charging and syncing the Fitbit * Ability to read and understand English * Ability to understand and comply with study procedures including wearing Fitbit for the entire length of the study * Approval of attending oncologist for participation in the study * Hb ≥ 8 g/dL (most recent lab draw) * Willingness and ability to provide written informed consent Exclusion Criteria: * Dementia, altered mental status, or psychiatric condition that would prohibit the understanding or rendering of informed consent * Presence of cardiac disease including acute MI within past 6 weeks, unstable angina, uncontrolled arrhythmias causing symptoms, active endocarditis, myocarditis, or pericarditis,symptomatic aortic stenosis, uncontrolled heart failure, syncope in the past 6 weeks, severe untreated hypertension at rest (\>180 mmHg systolic, \>100 mmHg diastolic) * Acute pulmonary embolism or thrombosis of lower extremities in the past 6 weeks * Uncontrolled asthma * Pulmonary edema * Suspected dissecting aneurysm * Room air desaturation at rest \</= 88% * Respiratory failure * Acute noncardiopulmonary disorder that may be aggravated by exercise * Mental impairment leading to inability to cooperate with instructions * Orthopedic impairment that compromises exercise performance