I remember, years ago, going to the thurs evening club chain gang on my roadie and having my arse (very politely and with encouragement for me to keep trying) handed to me on a plate.....
Then finding out a few weeks later the lad who rode for the local mtb shop had started turning up and was giving them a right kicking on his hardtail with knobblies.....that's the point you realise that even though you think you are fit.....you are actually shite :shock: