Gymnastics and the feast

Just a quick update on my kids' gymnastics and thanksgiving feast at school that I mentioned a little while back. I got sick that day and was only able to make it to the gymnastics class, and there I only used my flash on the camera, so no strobist stuff. I did however notice that when I was bouncing the flash in E-TTL mode, it was still underexposed--I don't know if it was because there were a lot of white walls around, but thanks to going the strobist route, I was comfortable using the manual mode on my flash and was able to turn the power up to 1/1 and get a proper exposure (the ceilings were really high!)