In Asian languages, the word for mind and the word for heart are same. So if you’re not hearing mindfulness in some deep way as heartfulness, you’re not really understanding it. Compassion and kindness towards oneself are intrinsically woven into it. You could think of mindfulness as wise and affectionate attention.
Perhaps the most "spiritual" thing any of us can do is simply to look through our own eyes, see with eyes of wholeness, and act with integrity and kindness.
Once you have established yourself as a center of love and kindness radiating throughout your being, which amounts to a cradling of yourself in loving kindness and acceptance, you can dwell here indefinitely, drinking at this fount, bathing it in, renewing yourself, nourishing yourself, enlivening yourself. This can be a profoundly healing practice for body and soul.