Hello- I'm new to this digital sports photography. I have a canon xti and 70-200mm f/2.8 L IS USM lens and oh well.... I did some shooting yesterday mountain bike race. i went to try the mode for AV (and shooting around 7pm gloomy) instead of sports mode.
My AV settings is: iso-800, Wb-cloudy, Evaluative metering, AI Servo and multiple shots. Anyways.... it's weird all my photos turn out so crappy as in soooooooo bad that it made me cry. The backgound was sharp the subject i'm shooting was all super blurry what did i do wrong? please help me... isn't the settings or i need to give myself to learn. any opinion will help...thanks!

Ann