Inclusion Criteria:  Children or adolescents between the ages of 5-18 years at enrollment and at least one parent (defined as a caregiver; biological or otherwise) Diagnosed with any oncological and/or hematological diagnosis Currently receiving or scheduled to receive any treatment for any oncological and/or hematological diagnosis or completed treatment <3 months  Exclusion Criteria:  Completed all treatment for their oncological or hematological diagnosis >3 months Unable to participate in physical activity as assessed by the patients' healthcare team or physical activity specialist Parent and/or patient cannot understand verbal English Parent is unwilling to be present (i.e., at home, in the same room depending on participant age and functional ability) during the physical activity sessions (required to ensure safety of the child/adolescent)