As we all move to make yoga a part of our lives, let's just quickly touchdown on what yoga is exactly:
The term yoga can be derived from either of two roots, yujir yoga (to yoke) or yuj samādhau (to concentrate). The Yoga Sūtras of Patañjali defines yoga as "the stilling of the changing states of the mind". Yoga has also been popularly defined as "union with the divine" in other contexts and traditions.
Various books and philosophies will expand on this theme at length. The core that I wish to share with you is that yoga boils down to anything that is done with one-pointed concentration. As simple as this seems, as humans we tend to think of a gazillion things all at once and find it extremely difficult to focus. If it were easy, we would all meditate for 3hours a day. Concentration is something that comes with practice though, and as much as yoga benefits our bodies, it also benefits our minds, bringing it to stillness as we focus on breath and body.
When you enter a class then, do your best to release your day, knowing that you can't do anything until class is done anyway. Focus on your body and your practice, honouring where you are and knowing you will get where you aim to be soon enough. Progress in yoga comes in steps.