Originally Posted by AzTallRider

I have blacked out from this... once. I stood up, felt the typical dizziness, heard the noise, and my vision was narrowing. All stuff I had started experiencing pretty regularly since I started seriously training. I grabbed the doorframe to steady myself, and the next thing I knew my wife was looking down at me asking "What are you doing?". I looked around, realized I was on the floor (with a bump on my head), and replied intelligently "I don't know." Interestingly, that's the same response I've given when I've crashed and someone has asked if I'm okay.