Yep I was in the drops. Honestly no idea what happened. As I said one moment I was sprinting with bike "dancing" under neath me, next I am on the ground sliding.
I'll try the suggestions. Thank you. A bit hesitant to do all out standing sprints on a trainer, that can't be good for the bike... Don't get me wrong I warm up on it all the time, including seated intervals, but standing?
and yes I have whole winter to get over it. Can't believe racing season is over, it flew by so fast!