An Introduction to Nature for Therapy -- Outdoor Therapies: A Choice of Paths to Follow -- Why Nature-based Therapy for Children, Youth, and Families? -- Making the Choice to Take Therapy Outside -- Nature-based Play, Regulation, and Healthy Neurophysiology -- Outdoor Risky Play in Nature-based Therapy -- Nature as Co-therapist -- Nature-based Therapy for Families -- Multi-family Nature-based Therapy -- Group Applications in Nature-based Therapy -- Ethics in Nature-based Therapy.