Yoga may offer benefits for children and adolescents affected by cancer or blood disease, yet there are challenges in translating evidence to practice. Yoga instructors are critical for the delivery of yoga. Understanding yoga instructors’ experiences offering yoga to children and adolescents affected by cancer or blood disease could provide information to guide required competencies and training, as well as elucidate factors to consider in future research and programs. Therefore, the present study sought to understand yoga instructors’ lived experiences preparing for and facilitating yoga for children and adolescents affected by cancer or blood disease. Fourteen yoga instructors with experience facilitating yoga for this population participated in semi-structured interviews, which were transcribed verbatim and analyzed using principles of interpretive description and thematic analysis. Five unique themes were identified: (1) “I believe in and see the perceived benefits of yoga on and off the mat”; (2) “I feel equipped to deliver yoga but desire further training”; (3) “what I need to deliver a safe yoga program”; (4) “I must be adaptable to successfully facilitate a yoga program”; and (5) “what I need to ensure yoga is widely available.” Findings highlight the varied and comprehensive training opportunities yoga instructors sought, while elucidating their training limitations. Yoga instructors shared their perspectives on concerted attention to safety, effectiveness, and access when developing research and programs. This study represents a first step toward defining required competencies for delivering yoga to this population and lays the foundation for future research and programs.