The better you get the harder it is

Today class was frustrating because nothing really happened. I didn't stretch that far, didn't push my boundaries that much, didn't sweat more than normal. Nothing spectacular happened. About the most exciting thing about class today was that I had the entire back corner of the room to myself. That's it. Class was not inspiring today.. is it time for me to make it more inspiring for myself? Or was it just an off day? Can I blame this on mother nature? I would like to think so.