In today's lesson, I wasn't sitting up properly and using my core the way I needed to. JM came over to help a bit and then said, "Don't give in to those old habits. Do you want to ride like a top rider or do you want to ride like a fixer?" She took a breath and added, "great riders can do great things with horses. On some horses you have to go there, but... you know. Sit up."
Anyhow, just another 'what's your excuse?' comment from my totally kick-butt let's-giter-done trainer.