When I have enough energy my morning home practice is the time to explore the asanas.
Second series consists of deep back bending asanas, deep forward bending asanas and advanced balancing asanas. I won't be bored.
I will use the wall for kapotasana. To stay longer as usual is what I intend to do. As usual I will be surprised what will happen.
The Ashtanga practice has challenges for all of us. As soon as something, an asana i.e. is mastered new challenges arise. That's why we all remain beginners. Sometimes the asanas themselves are the challenge. It can also be the vinyasas or the right vinyasa count. If someone does not feel challenged anymore something went wrong........