To me, sadhana is a daily spiritual practice allowing time and space for an individual to turn inward.
As Yogi Bhajan (of the Kundalini yoga tradition) says, "Sadhana is self-enrichment. It is not something which is done to please somebody or to gain something. Sadhana is a personal process in which you bring out your best."
Sadhana could be taking a walk in nature, doing breath work or yoga asanas on a mat, spending time meditating or chanting, reading and reflecting on a poem, journaling or simply watching the sun rise.
Please accept this post as a possible starting point for your own practice today.
Our ultimate goal, after all, is not a good death but a good life to the very end.
— Atul Gawande, Being Mortal: Medicine and What Matters in the End