Hardest part is maintaining your concentration. Course was 4 hours. You get tired, and my drop was on an exercise I'd done a couple of times. Bob
It's a good thing you noticed you were fatigued, a lot of riders don't. At the start of every class I tell the riders that they are going to be challenged physically, mentally and emotionally, and that leads to fatigue. I can keep an eye out for signs of fatigue, such as a rider dropping his head, shortend horizon (looking close instead of far), dropping their feet, or like you making mistakes they were not making a few moments ago. But the best gauge of fatigue is the rider. Fatigue leads to shortcuts and bad habits, and it does not do any good to practice bad habits.
In class yeserday I had a rider who had ALL the skills needed to do the exercises. All she lacked was confidence. She would be begin an exercise, and then something in her head would convince her she couldn't, and she would pull out. She only dropped the bike once and rode under control the whole day. So she began to cheat on the exercises and make wide approaches and exits. She knew what she was doing too. Another rider struggled ALL day. He said he had 30 years or riding experience, but it turned out to be 30 days of riding experience repeated for 30 years worth of weekends. I spent the WHOLE morning trying to break him of bad habits, like covering the front brake, dropping both feet, looking down and fighting the friction zone. He must have dropped that bike 10 times. Then there are riders like Joshua a rider who had taken the course many times. Everyone was amazed at his command and control, and were astonished to learn that he had been riding only 9 months. The difference is practice. Josh is a pilot and knows the value of regular practice, so he incorporates it into ALL aspects of his riding. Whenever he takes the bike out, he makes it a point to practice some technique. He has a hunger to learn and improve and I really appreciate that. He also knows when he is tired, and can recognize signs of fatigue.