I think being in nature heals chronic illness or pain on a spiritual level. When I was at my worst, looking outside my window at the birds and trees would fill my soul, which evolved into being outside in sunlight soaking in positive energy, to being able to walk through forests praying the rosary whilst listening to birds and being a guest of beautiful wildlife. The wildlife may give a feeling of true serenity, a glorious environment for finding inner peace. Having friends enduring similar health situations may be healing, while hiking in nature sharing synchronized steps while taking in nature. Sometimes it's helpful to be relective of the first steps and breathes before becoming a marathon runner, memories of moments from those early steps or breathes feel just as significant as the competitive experience.