There are many different explanations as to what Yoga is;  The one that has shed light onto me the most was from the ancient Hindu scriptures, the Bhagavad Gita:

“Yoga is the journey from the self, through the self, to the self.”

Yoga is a tool to be used by us all to dive into the exploration and transformation of our physical and spiritual selves.

May your journey begin here. ॐ