The purpose of this study is to compare the effect of a combination of art therapy (AT) and physical therapy (PT) to PT only in children undergoing hematopoietic cell transplant (HCT). Each child will receive daily AT and PT or only PT for 5 days per week for 2 weeks. These sessions will begin approximately on day 15 following the transplant. Prior to starting the sessions and following 2-weeks of sessions, we will measure your self-care and mobility skills. During each session, heart rate variability (i.e., time between heart beats) using a small monitor on the chest (about the size of a quarter), walking distance using an accelerometer (similar to wearing a watch), and self-reported happiness and excitability will be measured. Although results cannot be guaranteed, it is expected each group will benefit and demonstrate improvements in emotional state, self-care, and mobility skills.