Yoga keeps us flexible in both body and mind.
Perhaps you have an existing yoga practice or perhaps you have just a vague idea of what yoga is. Each of those circumstances are as good as each other when coming to yoga. Every day we come to practice with a slightly different body, in a slightly different set of conditions- our state of mind changes moment to moment taking with it our breath.
And so I encourage you to come to each practice with a beginners mind, without judgement, ego or expectation. Without mindlessly and rigidly going through routine and habit but rather engaging with and experiencing each unique moment.