what should I be feeling in my yoga class?

What should I be feeling in my yoga practice both during and following the class?
'Yoga is invigoration in relaxation. Freedom in routine. Confidence through self-control. Energy within and energy without.- Ymber Delecto.
Sounds contradictory right? But it isn't, it just is! I often say to my students to hold firm the pose, but still relaxed. Some have asked, how can I do this? I give the instruction to soften your gaze, your face and shoulders as you still hold steady and firm in your pose. When you combine your breathing with your movement in yoga poses and join your mind inward towards your body and what it is doing, feeling and thinking, then you are doing yoga.
When in poses like hip releasing postures, it is helpful to let go of your thoughts and stress within all parts of your body in order to feel the pose and muscles release more deeply.
When you continue your practice without judgement for yourself or others then you are experiencing the side effects of practice and that is 'to let go,'and feel tranquility within and kindness towards yourself and others.  When you continue to build strength, inwardly, you build strength within your character. Repeating this practice builds muscle memory and your mind also practices being mindful in the present moment, concentrating, persevering without judgement of yourself, which in turn becomes a habit that appears not only on your yoga mat, but in your wider world. Breathing properly using a fuller lung capacity during your practice can improve your endurance, well-being and overall efficiency of your lung capacity.
Furthermore, What you as an individual feel like in a pose is more important than what you look like. We are all biologically different, all have different physical body realities due to our genetics, our overall health, past injuries etc. Where you feel a stretch and how, is entirely unique to you  and besides if we wish yoga to create great functionality in our body, then it should be about feeling something that seems to allow some release into your body, wherever that may be for you. As long as you feel safe and stable then that is the right way to hold a pose for you. Just coming to your mat And being aware of your own body and mind and breath that moment is sometimes enough. Learn to listen to your own bodies cues rather then just your teachers. Just as no way of learning suits everyone. No one way of doing yoga suits everyone either. Find 'yourself' on the mat - literally and physically. This is your time.

References: Clarke, B. Your Body, Your Yoga. Yinyoga.com